Folding Concrete Block
Engineers would call the QuaDror a "space truss geometry," a wonky term for a sort of geometrical jujitsu: a structural joint that looks a little like a sawhorse, but can fold flat, making it both stunningly sturdy, remarkably flexible, and aesthetically pleasing.
The form is constructed of four identical L-shaped pieces, in which the angles are all the same, that operates with a kind of yin/yang action through a unique corner hinge. That allows it to open up for its full expression, or fold flat. It's always parallel to the ground and identical from all four sides.
Source: fastcodesign.comAdded: 25 February 2011