Abstract: A construction toy includes a plurality of rigid die-cut laminated plastic modular cards having a plurality of sides. A first side of a first card has a plurality of cuts opposite and complementary to respective cuts of a first side of a second card, such that the cards may be assembled by interfacing sides in mating relation. The side of a card extends along an axis and is defined by a varying height profile formed by inner and outer lands, an outer land being along the outer edge of the side, and an inner land being recessed inwardly therefrom. The cards have a first assembled condition with coincident axes providing two-dimensional and three-dimensional structures. A slit in the side enables a third assembled condition with noncoincident axes.