Abstract: A construction apparatus for models, stagecraft, models of matrices and the like. Elements with locations at equal increments construct a mosaic of locations and points in a tetrahedron solid or portion thereof with each selected point in predetermined angular and linear relationship to every other selected point in the mosaic. A selected ratio in size constructs a scale model of a full-size structure with corresponding mosaics. Components rotate at any location. Adjustable elements select any point in relation to said mosaic. Any component is movable to any corresponding location in said mosaic. An integral connector may include two parts facing outwardly on opposite sides of a location. First part includes a resilient snap-ring in a retaining groove adjacent to a polygonal recess. The first part engages a second part with a polygonal protrusion at a location in a second element. The edges of said protrusion expand said snap-ring to engage the two parts in a predetermined orientation.

Abstract: An economical frame and protector for photographs, visual displays, and three-dimensional objects, also useable as an envelope for mailing: for the purposes of protecting, framing, and storing the photograph while eliminating the weight of unnecessary wrappers subject to postage; and further providing, integral with the frame a selection of contours for cropping the photograph, slots for instant positioning in a selected orientation in the frame, artistic decorations, upright supporting means, stiffeners, and self-adhering protectors for removing defacing ink-like marks.

Abstract: This invention is an improved apparatus for recording and displaying a scene. A camera comprising a recording means is positioned at a location in a mosaic comprising a stage, to record said scene to be photographed which selectively extends beyond said mosaic. Said camera comprises a rotatable reflector selectively with focusing means, reflecting said scene to said recording means, for rotating said reflector instead of rotating said recording means. Said scene when projected upon a cyclorama substantially fills the field of vision of an observer, creating the illusion of reality. Said cyclorama is in the form of a generally symmetrical geometric figure. Said camera selectively rotates at a uniform speed in a predetermined pattern, and at least one projector is mounted on the optical axis of said camera for projecting the image recorded on said film back to the portion of said cyclorama corresponding to the respective portion of said scene.