Abstract: The top surface of a resin decking has an inclined plane which inclines downward from the center to the periphery. The height of the periphery of the top surface is uniform. Convex elongated portions or protrusions for guiding drainage are provided extending radially on the top surface. Drainage holes are provided near ends of the elongated protrusions. The decking allows efficient drainage on the top surface thereof.

Abstract: A angular interlocking floor tile is provided with a generally flat top surface, a parallel bottom surface, wherein the tile includes two elongated sides which converge to a point or short inner side at one end and which sides diverge at an internal angle of less than 90.degree. to be joined at their other ends by a beveled outer edge surface. The elongated sides are formed with a plurality of female cavities located adjacent to each of the sides. Each of the female cavities is positioned to mate with a corresponding male connecting member of a neighboring tile of a runner mat whereby the runner mat is able to make variety of turns. Alternatively, each of the elongated sides may be formed with an additional integral interlocking strip having male connecting members which may be used to mate with a corresponding female cavities of a neighboring tile. When the interlocking strip is not needed it may be removed.

Abstract: The invention relates to a ground covering of pentagonal shaped concrete slabs (F.sub.1) placed against another with joints. The shaped slabs are simple to produce and simple to lay and in order to give such a covering an appearance similar to a ground covering of irregular quarry slabs each shaped slab has two adjacent straight sides of equal length disposed at an obtuse angle, two adjoining concave sides of equal length and equal curvature, and a convex side disposed therebetween which is twice the length of the concave sides and has a curvature corresponding to the curvature of the concave sides. Together the three shaped slabs form a group of three, the straight sides abutting one another with the formation of a star-shaped joint. The outer convex sides of one group of three abut the concave sides of the adjacent group of three and vice versa.

Abstract: A surfacing block (1) has upper and lower surfaces (2, 7) bounded by walls (5) extending between the surfaces (2, 7). The surfaces (2, 7) are of a generally cruciform shape having four arms (4) each of which extend in a direction substantially parallel to the lower surface (7) and substantially perpendicular to two of the other arms (4) of the block. The block (1) has around the boundary of its surface projections (8) and/or recesses (9) for interlocking engagement with recesses and/or projections of a neighbouring block. The shape of the block helps to improve the resistance to movement of the block when laid with similar blocks.

Abstract: A unitary paving block having an exposed surface in use having a multitude of markings to simulate individual, random paving elements has a periphery with a shape which enables the block to be laid with other similar blocks in an irregular, substantially unrepeated paving array. The shape of the periphery of the blocks is such that the blocks can be laid with each block angularly moved with respect to each other and/or laid in staggered relationship with respect to each other.

Abstract: A paving element for the water-permeable reinforcement of surfaces, said paving element comprising a top surface, a bottom surface and a plurality of sides. One or more of the sides have vertical recesses extending from the top surface of the paving element to the bottom surface. The recesses are disposed asymmetrically about the mid points of the sides such that recesses of the adjacent sides of neighboring elements are offset from one another when the neighboring elements are laid in alignment, thereby avoiding alignment of the recesses. Alternatively, an offset of the recesses on neighboring stones is achieved by laying the elements in a displaced or staggered manner.

Abstract: The present invention provides a textured tile for embedment in fresh concrete on a platform or walking surface comprising a generally planer element with an upper surface and a lower surface, said upper surface having a plurality of upper projections therefrom to provide a distinctive texture relative to the surface of the platform or walkway, said tile having two opposite side edges intended for alignment with corresponding side edges of other tiles, front and rear edges at least one of which faces oncoming pedestrian traffic. Vertical depending flanges are provided along said opposite side edges and said front and rear edges. There is a plurality of holes in said depending flanges and a series of projections depending from the lower surface of the generally planer element.

Abstract: The present invention pertains to signage comprised of symbols or indicia that is adapted to be attached to a horizontal surface, such as pavement, asphalt or cement. The signage is comprised of a plurality of separate signage portions, each of which has ends which are spaced apart from the ends of all of the other signage portions to allow liquid to drain from the pavement within the signage portions when the signage portions are attached to the pavement. Some of the ends of the signage portions have only a convex top face and a face that is substantially perpendicular to the pavement, while other signage portions have ends with both a face that is substantially perpendicular to the pavement and an angled face connecting the face that is substantially perpendicular to the pavement to a convex top face of the signage portion that is substantially parallel with the pavement.

Abstract: A surface covering formed by planar components includes a plurality of concentric rings with each ring formed by corner components having two pairs of parallel sides of different length. The shorter sides of the pairs of parallel sides meeting at an angle equal to an angle formed by adjacent sides of a regular polygon. While the longer sides of the pairs of parallel sides meet at an angle equal to an angle formed by adjacent sides of the regular polygon. Planar infill components are utilized between the corner components with adjacent polygonal rings varying in size by a whole number of infill components. Spacing elements may be disposed between adjacent concentric polygonal rings.

Abstract: A paving stone, in particular made of concrete, is utilized to produce a stable, highly water-permeable flooring. The paving stones are provided with two opposed side surfaces and two opposed end surfaces, each side and end surface having a trapezoidal recess formed therein; and further, each recess of each side surface is bordered by a bordering surface having an additional recess formed therein.

Abstract: This invention provides an interlocking ground covering element, the shape of which is an abstraction of the shape of the state of Texas. The interlocking of multiple adjacent elements is obtained by the inherent projections and recesses comprising the element's shape. The elements can be used to cover horizontal surfaces as in paving or vertical surfaces as seen in retaining walls.

Abstract: A concrete paving stone adapted to be disposed in circular and elongate paving configurations. The paving stone includes at least two side walls and a substantially planar upper face, each of the side walls being an arched side wall and including an elevated face at a center region thereof which comprises an abutting surface and two associated wedge surfaces adjoining the abutting surface on both sides thereof. The associated wedge surfaces extend from the abutting surface to an associated arched side wall. The elevated face further extends across a substantial portion of a length of the associated arched side wall and is effective for creating a fixed abutment between adjoining arched side walls of adjoining paving stones in a paving configuration.

Abstract: A roadway for bicycle and other tired wheel vehicles formed of a plurality of end-to-end abutting tiles, preferably of a structural foam plastic such as polyethylene includes a generally rigid base having opposed top and bottom surfaces, with the top surface being flat and carrying integrally longitudinally and laterally spaced arcuate ridges. The arcuate ridges form alternating, laterally aligned rows of longitudinally spaced, oppositely facing arcuate ridges, with the arcuate ridges of a given row being offset laterally from corresponding arcuate ridges of adjacent longitudinally spaced rows by one half the length of an arcuate ridge. Further, the arcuate ridges of each lateral row are spaced from each other a distance such that the ends of the arcuate ridges of a given row lie within the concave curve of arcuate ridges of the adjacent, oppositely facing lateral row.

Abstract: A paving stone (10) is provided which includes individual sectors (20, 30) of uniform size and shape. Each sector (20, 30) is joined together to form a unique pattern such as a cross-paver (10), a Z-paver (110) or an S-paver (210). Some sectors (20, 30) are tips sectors (20) which attach to only one other central sector (30) and some sectors (20, 30) are central sectors (30) which attach to two or more other top sectors (20). Each of the sectors (20, 30) extend between a common top surface (40) and a bottom surface (50). An outside surface (60) defines a periphery of the paving stone. A V-groove (80) is positioned on the top surface (40) at margins between adjacent sectors (20, 30). The V-groove (80) includes a crease (82) on a bottom thereof which encourages vertical crack propagation from the top surface (40) through to the bottom surface (50) in a plane when a appropriate force-applying tool is utilized. When this occurs the paver (10) is modified into a paver of a different shape.

Abstract: An apparatus for use in the in situ construction of patterned pavement includes a container (14) and a matrix of capped tubes (15) mounted to the floor of the container. Concrete (17) is distributed within the container and about the tubes and allowed to hardened to form a slab (11) of patterned pavement. The caps are then removed and another material is placed within the tubes to finish the pavement.

Abstract: A set of shaped stones for paving ground areas with wide gaps between the shaped stones is provided which comprises first and second shaped stones, with the second shaped stones having a smaller plan view area than the first shaped stones. A plurality of integral spacing projections are provided on the periphery of only one of the first and second shaped stones for defining the wide gaps in the shaped stone pavement.

Abstract: The side surfaces of compound stones are provided with relatively flat elements which interlock with little play when said stones are laid out, while adjoining side surfaces of neighboring stones are in contact along two lines only. A compromise between a sufficient mutual securement of the stones and a certain mutual mobility thereof is thus obtained. In particular, a certain tilting of neighboring stones with respect to each other is possible, whereby it is possible to produce pavements in uneven places.

Abstract: An angular paving stone (2) for paving areas, comprising two outer sides (16), two inner sides (18) and two face sides (20). At the five outer corners (4) of the angular paving stone (2) there are provided quarter recesses (22). At the center of the outer sides (16) of the angular paving stone (2) there are provided half recesses (24). At the inner corner (6) of the angular paving stone (2) there is provided a three-quarter recess (26). The partial recesses (22, 24, 26) supplement each other in the paved area so as to form full recesses (38) for water discharge.

Abstract: A tile for paving and floor and wall covering comprises a substantially flat body with a polygonal periphery with plural recess and different parallel sides opposite to one another. The tile is juxtaposed by fitting it together with identical tiles in a first orientation to completely cover a surface or a second orientation to define free spaces of substantially identical size and width. The orientation is selectively preestablished according to tile sides to be joined.

Abstract: A tactile tile having a flat plate with a plurality of raised areas, said plate and raised areas comprised of polyurethane.

Abstract: A tile for positioning on walkways, crosswalks and other areas of pedestrian traffic for providing direction and warning to visually handicapped persons. The tile includes a flat plate having top and bottom surfaces and an array of raised bumps coupled and formed integrally with the top surface of the plate and projecting upward therefrom in a tactile pattern for providing tactile information. The combination of plate and raised bumps is comprised of fiber reinforced, thermosetting resin to form a rigid tile of integral construction.

Abstract: A paving stone is provided that can be laid in a plurality of open patterns, each presenting a different amount of drainage area, while retaining an interlocking relationship between adjacent stones of the pattern. In the preferred embodiment, the stone can also be laid in a closed pattern, with no drainage areas provided other than the drainage at the boundaries of the stones. Each side surface of the stone has an odd number of faces, arranged in a stair-step shape. Preferably, each of the side surfaces is symmetrical about the center face, and all sides, or at least opposite sides, are identical.

Abstract: Masonry landscaping modules and methods for landscaping using the modules are disclosed. The masonry modules each have an upper portion comprising a plurality of masonry elements bonded to an upper surface of a lower portion. The masonry elements, preferably clay brick, are arranged in predetermined patterns and spaced from each other on the upper surface of the lower portion to define masonry joints between them. The lower portion comprises a concrete base having side walls which taper inwardly toward a bottom surface of the lower portion to define a trapezoidally shaped lower portion. Either steel reinforcing bars or fiberglass fibers are embedded in the lower portion. In completed products such as patios and walkways where multiple modules are placed adjacent to each other, inverted Y-shaped or "key" paving joints are formed between modules. Methods of laying the modules to form a variety of masonry products such as paving and other decorative arrangements are disclosed.

Abstract: A paving block is made up, as seen in plan, of two connected portions (10, 12) one portion (10) comprising four connected substantially identical quadrants (14-17) and the other portion (12) having an inside-out pillow shape defined substantially by four arcuate surfaces. The curvature of each surface is substantially the same as that of the curved boundary of any one of the quadrants (14-17). Such a block may have various proportions, and may be made to various dimensions. However it is preferred for the blocks to be of such a size and weight that one can readily be held in one hand. This simplifies and makes less expensive the process of laying the blocks. Such blocks when laid have improved structural stability.

Abstract: The invention relates to paving blocks or tiles or to wall tiles, and has for its objective to provide a block or tile shape giving substantial freedom to a designer in providing any one of a considerable number of available patterns employing numbers of blocks or tiles of the same size. This objective is met by a construction comprising a generally rectangular body (2) having two generally parallel sides (3) and two ends each formed by two curved surfaces (3, 5) one end being formed by two equally and oppositely curved convex surfaces (4) that meet on the general center plane of the block or tile, and the other end being formed by two equally and oppositely curved concave surfaces (4) that meet on the general center plane of the block or tile (1), all the curved surfaces being of the same curvature.

Abstract: A unique shaped paving block having a top face, bottom face and 18 flat sides that permits its ready placement by being rotated 60 degrees or less to orient with blocks already in position. The six groups of three exterior and interior sides or faces with an intermediate joining side face provides lock points so that the block is especially usable in high loading areas such as industrial applications and applications at airports.

Abstract: The embeddable paving block intended for surfacing roadways and other areas of ground, of the type including four identical arms disposed at right-angles to one another, each of the arms having shoulders distributed over the lateral faces and the ends of each of these arms, the shoulders being disposed to overlap in the plane of the surfacing the corresponding shoulders on the adjacent blocks in order to prevent the plane from opening up under the effect of any traction and in order to ensure a constant thickness of the joints.

Abstract: Ornamental interlocking inserts are provided, for use with existing structures of interlocking stones, bricks, tiles or the like, or with new structures being built, and a process of providing the inserts is disclosed. The inserts may have a graphic or alphanumeric design, and may be provided with colored portions, to result in a pleasing visual effect.

Abstract: An interlocking paving stone which has in certain embodiments a twelve-sided main section and an eight-sided tail section, and in certain other embodiments, has a twenty-sided main section and a sixteen-sided tail section, which main and tail sections are integral with each other, coplanar, and symmetrical about a longitudinal plane perpendicular to the paving stone which bisects it into two equal longitudinally extending sections. The relationship of the lengths of the sides to each other and angles they define are such that a large number of different interlocking patterns are possible which exhibit a high degree of interlock along both opposite edges and both opposite ends of the stones.

Abstract: Two forms of paving block are disclosed each having a hexagonal body portion capable of being divided along a central score line into two mirror image portions and one of the forms of block further containing a square stem portion also separable from its associated body portion along a further score line. A ground covering structure is formed by laying the blocks laterally side by side to form a substantially continuous paving employing both forms of blocks and selectively breaking the hexagonal portion of such blocks and fitting the severed mirror image portions into voids whereby the perimeter of the structure can be defined by straight lines without further breaking or cutting of any of the block forms.

Abstract: A molded and cured concrete paving member for paving driveways, walkways, patios, plazas and the like, comprising portland cement, a coal slag aggregate, water and an acrylic additive. The blend is poured into a non-porous, high gloss polyvinylchloride (PVC) mold in a relative dry mix and is vibrated to drive the portland cement to the bottom of the mold and to suspend the aggregate into chemical suspension. This also drives the lighter weight water to the top of the molding configuration, which top, due to the configuration or orientation of the mold, ultimately becomes the bottom of the paving member. The molding is accomplished while hanging from a frame in a so-called bag mold so that when the concrete expands and contracts in the relatively flexible mold during the hydration curing process a bond of the concrete to the PVC mold is maintained. The non-porosity of the high gloss mold surface and induced vibration pull the portland cement to the bottom of the mold cavity and suspend the aggregate.

Abstract: A paving stone that can be laid in one or more open patterns, permitting water to drain through areas in the formed ground cover, is provided. The stone has six interlocking multifaced side surfaces, three on a concave part of the stone and three on a convex part of the stone, that interlock with complimentary side surfaces of adjacent stones, and has eight corner side surfaces that bound and define the shape of drainage areas. Each of the drainage areas is surrounded by identical interlocking stones. In the preferred embodiment, the multifaced surfaces of each of the parts are identical so that the stones can be laid interchangeably at any place in a runner bond or herringbone pattern. The faces of the multifaced side surfaces of the stones are preferably planar and form V-shaped interlocking surfaces.

Abstract: A paving block assembly and first and second paving blocks therefor. The first and second paving blocks are combined to form a continuous paving surface. Spacers are provided on the blocks for assuring, among other things, correct positioning of the blocks in a continuous paving surface. The paving blocks have concave and convex curved side surfaces, which increase the durability of the paving blocks. The paving blocks in the paving block assembly form an arch shaped pattern, which increases the stability of the paving block assembly.

Abstract: A slab element for covering a ground surface and the like, the linear, curvilinear, and circular-design surfaces produced by the slab elements, and a method of forming the design surfaces. The slab element comprises a rectangular slab element having a convex and a concave end adapted to interlock and be rotatable, with grout material therebetween, and the peripheral sides of the slab element entirely curvilinear.

Abstract: A revetment unit for protecting shoreline or waterway embankments from eron comprising a generally L-shaped web having first and second arm portions converging at an apex and forming a 90.degree. right angle. Each of the first and second arm portions terminate at end portions. Identical cylinder members are associated with the web and extend above and below the plane of the web. The cylinder members have a height substantially less than their width and a single cylinder member is positioned at each of the end portions and at the apex. The web has a width slightly less than the diameter of the cylinder members yet greater than the radius of the cylinder members. The end portion cylinders are equally spaced from the apex cylinder a distance between about 0.10 to about 0.25 of the diameter of the cylinders.

Abstract: A integrally molded paving stone or slab element of ceramic material, and a ground cover made up of repeatable patterns of such elements wherein the slab elements include a hexagonal section having two 90.degree. and four 135.degree. angles and lateral and longitudinal sides and a square section with a side adjoining a side of the hexagon which is adjacent one of the 90.degree. angles. The lateral sides of the hexagon adjacent the 90.degree. angles and the sides of the square are from 3.5" to 5", approximately and the longitudinal sides of the hexagon section are such that there are approximately 9" to 11" from one 90.degree. angle to the other. Such a paving stone provides superior support for standard dual wheel truck loads when assembled in a ground cover.

Abstract: A kit of cobble stone elements of varied shapes which when fitted together into a close-fitting fan-shaped composite of which a plurality of the fan shaped composites symbolic of a fish scale form a close-fitting integrated repetitive design of unique and novel appearance.

Abstract: A circular paving stone arrangement is disclosed employing five discrete shapes of molded paving blocks. Two of the molded paving blocks have novel fan-shaped or wedge-shaped forms and are adapted to be used with square, circular, and rectangular blocks in a predetermined sequence in the construction of a unique circular paving stone arrangement. The gap between adjacent sides of adjacent blocks in minimal and thereby reduces any possibility of injury to person or footwear.

Abstract: An interlocking paving stone which has a twelve-sided main section and an eight-sided tail section which are integral with each other, coplanar, and symmetrical about a longitudinal plane perpendicular to the paving stone which bisects it into two equal longitudinally extending sections. The relationship of the lengths of the sides to each other and angles they define are such that a large number of different interlocking patterns are possible which exhibit a high degree of interlock along both opposite edges and both opposite ends of the stones.

Abstract: A paving block is provided for forming of paved surfaces comprising a plurality of the block laid in adjacent relationship. The blocks are of a planar configuration having a primary body section with coplanar top and bottom surfaces and a vertical peripheral side wall extending between the top and bottom surfaces. Four main wall elements are included in the peripheral wall with these wall elements disposed in parallel pairs, the pairs being positioned in orthogonal relationship to each other. A fifth wall element is included in the peripheral side wall and is positioned between two adjacent ones of the main wall elements in equiangular relationship to each other. In one version of the paving block, two tongue elements are provided in integrally formed relationship with the primary body section and project a distance laterally therefrom at diametrically opposed corners adjacent the respective main wall elements that are interconnected by the fifth wall element.

Abstract: The fracture-free paving block comprises a cement block substrate and a top solid layer, and is characterized in that the top layer is selected from a cured cement mortar layer and tile-like layer firmly bonded to the substrate with cement mortar; the top layer is bonded to the block substrate with lateral margins of 1 to 8 mm wide in horizontal distance from the peripheral edges of the substrate; and the vertical distance from the surface of the top layer to the peripheral edge of the substrate is 5 to 50 mm.

Abstract: Flooring and/or tiling with golden arabesque designs is configurated by three square pieces with sides ( ##EQU1## ) which are able to function through any combination of one, two or three pieces. The first of these pieces has one of its diagonal lines with a length of "a". The second square bears an identical representation of its diagonal, and a parallel tracing to the diagonal at a distance from a vertex closest thereto of ( ##EQU2## ) while the third piece has both diagonals measuring "a" illustrated thereon, and several tracings parallel to one of its diagonals, at a distance of ( ##EQU3## ) "a" being any real number.

Abstract: A paving material includes a plurality of identical paving stones which are similarly oriented and interlock to form a ground cover which completely covers the ground without being combined with stones of other shapes. The shape of the stones is defined by an array of concentric circle pairs centered at the intersections of two sets of parallel and equally spaced lines. The circles intersect so as to form two shapes, one shape being a segment of a solid cylinder with a radius that of the inner circle and the other being a segment of an open annular ring lying between an inner and an outer circle. Each stone includes one of the solid cylindrical segments integrally joined with one or two parts of an annular segment. Optionally, a false joint is marked by an arcuate groove in the upper surface of each stone.

Abstract: A portable, prefabricated, reinforced asphalt composition paving tile having a thickness from about one-half to about two and one-half inches is disclosed having upper surface and lower surface interlocking extensions. The tile is particularly suitable for the convenient installation of pavement on small surface areas where heavy construction equipment would be difficult to use.

Abstract: The paving stone set consists of stones 11-16 each with six lateral boundary surfaces 1-6, 17-22. Four of these boundary surfaces 1 and 4; 3 and 5; 18 and 21; 19 and 22 are parallel to one of the other of the four surfaces, while the remaining two surfaces 2 and 6; 17 and 20 define planes which intersect at an acute angle. On the straight edges, the stones 11-13 are laid alternatingly. A joint pattern is created with expansion joints, which do not stand vertically to the support joints. The expansion joints are formed from two wedges directed opposite to one another, and therefore have an effect which is irregular in comparison with the support joints. The slotted boundary surfaces 2, 6 make it possible to lay the stones 11-13 according to the sloping angles selected in curves with small radii chosen as desired, whereby the wedge-shaped joints close gradually. The stones 14-16 serve as a supplementary curve set, and make possible the laying of Roman arrow patterns, as well as an Archimedean spiral.

Abstract: Dynamic fountain displays and methods of creating the same for providing water displays wnich may substantially constantly vary in interesting and seemingly endless ways. In one form, the fountains are comprised of a matrix of fountain nozzles positioned below a deck formed with open joint paving so as to be useable as a patio or walkway when the fountain is not used. Each nozzle is connected to a source of water under pressure through a proportional control system for that nozzle responsive to a computer output so that each nozzle may be independently and proportionally controlled by the computer as desired. To facilitate the programming of the settings for a large array of nozzles, a plurality such as 256 individual patterns for the array of nozzles are first mutually programmed.

Abstract: A paving stone set includes a square paving-stone, a larger rectangular paving-stone and a smaller rectangular paving-stone. Each of the paving stones has generally planar top and bottom surfaces and generally planar side walls, with a clothoid shaped surface being formed on two corners of each paving-stone. The radius of curvature of each clothoid shaped surface may be different from that of the other clothoid shaped surfaces on each paving-stone. The top surface may have a different color and texture than the bottom surface. The paving-stones may be irregularly broken surfaces.

Abstract: Known groundcovering elements (44) consist of three basic shaped slabs which are connected to form a unit and which are delimited from one another by at least two dummy joints (stem dummy joint 74 and middle dummy joint 81), the peripheral surface having projections (67, 68, 79) and depressions (69, 70, 80) along an (imaginary) base line to form a toothing. To improve the stability and laying of such groundcovering elements (44), it is proposed to make these T-shaped by means of a half-size stem (13) formed approximately centrally on an elongate crossbar (12). When rhombi (45-47) are used as the basic shaped slab, the groundcovering element (44) has the form of an inclined "T".

Abstract: A tile for positioning on walkways, crosswalks and other areas of pedestrian traffic for providing direction and warning to visually handicapped persons. The tile comprises a flat plate having a chamfered edge and including raised bumps coupled to a top surface of the plate and projecting upward therefrom to a maximum height of less than 8 millimeters. A flowable adhesive used at the chamfered edge provides for a tapered seal around the tile or for formation of an expansion joint between two contiguous tiles. The bumps are configured as truncated structure having a larger base and tapered to a top surface which bears the foot traffic. A bottom surface of the tile includes a uniform adhesive layer which enables attachment of the tile to a street surface. A system of tiles for assisting visually handicapped persons across the street is also disclosed and includes a combination of dot and bar tiles oriented to give direction to the pedestrian.

Abstract: A paving block has six sides, and a top (10) and a bottom surface (12). Two of the side surfaces (14, 16) are substantially parallel and substantially twice as long as each of the other four side surfaces (18, 20, 22, 24), two surfaces (18, 20) of the said other four side surfaces each making an angle of substantially 120.degree. with one end of each of the longer side surfaces (14, 16) and each other side surface (22, 24) making an angle of substantially 60.degree. with the other end of each of the longer side surfaces (14, 16). In other words, a block according to the invention as seen in plan is of `chevron` shape a shape that could also be termed a squat `V` shape. This is a simple, easily manufactured block, which permits numerous different arrangements to be laid.