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Con quattro tetraedri regolari di lato 1 e un ottaedro regolare di lato 1 si può costruir...
Two baloons: the structure of the one in the foreground recalls the subdivision of the sph...
This hot air balloon has the shape of a polyhedron obtained by putting 20 pyramids on the ...
The stella octangula is made of two tetrahedra that are disposed in such a way that their ...
A regular tetrahedron. You can reconstruct it between the mirrors of the corresponding kal...
These cubic boxes can be opened in different ways, in order to put in evidence the possibl...
A small stellated dodecahedron: the faces are 5-pointed stars and there are 5 of them arou...
A cube. You can reconstruct it between the mirrors of the corresponding kaleidoscope. This...
There are 30 ways to colour a cube, so that each face has a different colour. You can see ...
A regular octahedron. You can reconstruct in the mirrors of the kaleidoscope corresponding...
