Dodecahedral educational assembly toy - has forty-two convex and concave shaped parts forming pentagons and equilateral triangles

摘要

The logic toy is constructed as a regular geometric body, being dodecahedral, and consists of twelve equal pentagon shaped parts, and twenty equal triangle shaped parts. The parts are rotatable in groups of twelve on six spindles. Forty-two parts have lateral convex and concave or conical surfaces. Twelve parts are mating laterally with five equal parts of the concave surfaces.