Abstract: A retaining wall, wherein the lower edges of vertical walls (8) within a shell (3) are fitted with at least one coupling tab interacting with the plane upper vertical edges of the adjacent underlying shell. The vertical walls (6, 7) having any shape are also provided with at least one coupling tab. The transverse vertical wall (7) between the two building elements forming the double building element comprises a breakable portion (13) such that a decorative facing (14) is exposed on its outer surface for each building element, and said decorative facing (14) is exposed on its outer surface for each building element, and said decorative facing (14), when locally removed, reveals a surface with a "rough hewn stone" appearance.

Abstract: Dry-mounted construction elements, each of the type constituted by a bottomless container comprising vertical partitions, a first vertical partition, parallel to the front wall of the container, delimiting a large front space (5), which serves as a flower pot and at least one rear space (6) which serves as a root cavity for the upper container and which is offset rearwardly from the lower container, this latter space (6) being divided in at least two smaller spaces (7, 8) by a second vertical partition (4) perpendicular to the front wall and to the first partition. The construction element has a rear portion which has a notch (10) disposed on each upper side edge of the container, and two small cavities or spaces (14, 15) behind the notches. A wall built of these elements is useful as a retaining wall, flower box, or noise barrier.