Cards with the shape of regular polyhedra, here used to make a uniform tessellation (3,4,6...
An exhibit of "Matematica viva", in Lisbon (Portugal) that shows that we need six colours ...
Can we put a straight rule inside a hole with the shape of a hyperbole? This experience sh...
You can illustrate the focal properties of the ellipse with a billiard-table (with ellipti...
A cube and the octahedron that has the vertices in the centres of the faces of the cube re...
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 ...
