Abstract: A geometric construction module formed from a substantially flat, flexible material, the module comprising a polygon based shape having two straight edges; and a locking tab pair integral with each one of the straight edges to form joining edges, each locking tab of the locking tab pair having a notch at the straight edge, the notches of each locking tab pair being symmetrical about a center line of the joining edge. Multiple construction modules can be releasably attached at the joining edges to form models.