A polyhedron

A cuboctahedron. Image taken from Giovanni Strüver's memoir Studi sulla Mineralogia Ital...

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Dodecahedron and icosahedron

Dodecahedron and icosahedron are dual polyhedra: the centres of the faces of a dodecahedro...

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Cube and octahedron

Cubes and octahedra are dual polyhedra. The centres of the faces of a cube are vertices of...

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Una cubica

Un modello di cubica, cioè di una superficie algebrica di grado 3.Si può vedere una cubi...

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Un granchio

Un granchio e la sua ombra, a Kafountine (Senegal).

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Un comignolo

In questo comignolo a Casale Marittimo si possono vedere delle eliche; e si può anche vis...

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A flower

The succulent plant known as "The earth" (because it shows the meridians) and a flower. Wh...

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A lamp

A lamp with the shape of a great stellated dodecahedron.

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What is a line?

The line of the horizon provides a good representation of the concept of line.

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A die

An unusual die with the shape of a regular tetrahedron.

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