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Here we see 12 ways to colour a pentagon with 5 colours. Are they all the possible combina...
At the Rheinpark in Cologne, these pipes seem to draw a ruled surface.
The nine planes of symmetry of the cube: the three planes parallel to a couple of opposite...
Lo spezzamento di un cubo in un tetraedro regolare e 4 tetraedri, non regolari, con vertic...
The construction of this baita (a typical Alpine hut) in Valnontey gives a cue about the "...
Regular polyhedra.Exhibit of Un tuffo nella quarta dimensione - Diving in the 4th dimensio...
One of the 11 plane nets of the cube is folding up in the three-dimensional space to form ...
One of the 11 plane nets of the cube is folding up in the three-dimensional space to form ...
Here we see a plane net of the dodecahedron folding up in the three-dimensional space to f...
This drawing, attributed to Leonardo da Vinci and taken from the plates of Luca Pacioli's ...
