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You can illustrate the focal properties of the ellipse with a billiard-table (with ellipti...
A problem of equidecomposition between two regular octagons and a regular octagon; from th...
Kono, a game of strategy, from Korea, where it is very popular. The chessboard has dihedra...
A cube and the octahedron that has the vertices in the centres of the faces of the cube re...
A cube with three faces of different colours; if we observe it from a point of view which ...
The floors of the Certosa di Calci (Pisa) often present a tridimensional effect. Here we c...
Pachisi, a path game, based on case and fortune, of Indian origin; the dice are seashells ...
Seega, a game of war and strategy, of unknown origins (perhaps from the ancient Egypt)The ...
A virtual octahedron reproduced between three mutually perpendicular mirrors..From the exh...
Some models of polyhedra: the biggest ones are a uniform polyhedron of type (5,6,6) and a ...
