An interlockable element for a structure assembly set includes an at least partially
planar body and a connector edge having associated therewith a first A-type and
B-type connector pair disposed about a first axis of rotation and a second A-type
and B-type connector pair disposed about a second axis of rotation. The first and
second axes of rotation are disposed on opposing sides of a generally rectangular
quadrilateral of a specified dimension. Each of one pair of diagonally opposite
vertices of the quadrilateral are situated internally to each of the A-type connectors
and each of the other pair of diagonally opposite vertices of the quadrilateral
are situated internally to each of the B-type connectors; and the quadrilateral
is generally disposed in a plane that is generally perpendicular to the plane of
the body of the interlockable element. The A-type connectors include a pair of
rods having protrusions and the B-type connectors include a pair of rods having
facing indentations, and the connector pairs of one element are adapted for rotational
interlocking engagement with the connector pairs of another like element.
