Abstract: A construction toy comprising a plurality of flat members constituting flat bars and/or assembly members formed with openings therein. Separate coupling means are provided for coupling the members and include resilient protrusions releasably engaging in the openings of the members to be coupled. The members are formed with surface recesses in the flat sides arranged axially symmetrically with respect to the openings, and the coupling means includes projections complementary in shape to that of the surface recesses and which engage therein when the members are coupled by the coupling means, the projections constituting at least two pins complementary in arrangement to that of the surface recesses. Slots equal in width to the thickness of the members are provided in the edges, and the edges are beveled and define edge recesses therebetween.