Chinese puzzle piece with modified structure

摘要

Each element of a tangram or Chinese puzzle is composed of an innermost relatively thick piece of soft elastic material (1). Two thin sheets (2) of transparent plastics lie on the two opposite sides of the elastic-ply, and there are two outermost coloured layers (3). Each element of the tangram is capable of elastically holding a thin sheet of another element which has been inserted into an interstice between any two adjacent layers, thereby engaging the two elements together. The parts are held together by glueing the layers (3) to a prism (4).