Connectable polygonal construction modules

A polygonal construction module comprising a triangular body portion having edge faces, a top face and a bottom face, each said edge face having a plurality of substantially identical outwardly projecting fingers with gaps substantially identical therebetween, said fingers being arranged to provide a snap-together lateral interlock between fingers of adjacent modules while providing hinging action between modules on an axis parallel to said side face, and at least one annular connector element projecting perpendicularly from the body portion top face for establishing a friction fit with a like connector element in face-to-face interlocking engagement, said connector element comprising a series of fewer than ten projections arranged in a uniform circular array having an outer diameter of about 10-20 mm, each projection being segmental in shape with radial side walls and having a height of about 3.5-5.0 mm and the space between each pair of projections being the same shape and size as each projection whereby to receive a projection of said like connector element when engaged therewith, the engaging projections being held in interlocking engagement solely by frictional contact between engaging projection side walls, and the body portion directly beneath each connector element being thin relative to the height and width of each projection to thereby provide said array as a whole with substantially greater flexibility than the intrinsic flexibility of each projection thereby to accommodate dimensional inaccuracies of the projections when engaged with a said like connector element and enhance the firmness of frictional contact between engaging radial side walls.