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A seashell of Nautilus
Section of a seashell of Nautilus, a mollusc that had been considered extinct until 1829, ...
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A feather of peacock
The feather of a peacock provides an example of dihedral symmetry of type D1.
A film of soap
A film of soap obtained with a cubic frame. You can see an application of the “Plateau l...
A group of diatoms, unicellular algae characterized by a (transparent!) covering in silica...
Unicellular alga covered in silica. The photo of this diatom seen under an optical microsc...
How to get a 600-cell
A picture of the construction of a 600-cell, which is one of the six regular polytopes in ...
Constructing a 120-cell
The picture shows some of the 120 dodecahedra in a 120-cell (it is one of the six regular ...
Schlegel's diagram of a hypercube.
How to get a 120-cell
This picture gives you an idea of how to get a 120-cell, which is one of the six regular p...
La Grande Arche
The architectural structure of La Grande Arche (Paris, quarter La Defense) recalls the str...
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