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The flag of Germany has a dihedral symmetry of type D1.
The flag of Europe has a dihedral symmetry of type D1. The 12 equal stars can't produce a ...
Lower and upper face of the leaf of Viola sp. This photo, taken from the right point of v...
A fruit of country elm-tree called Samara (Ulmus minor). A photo of the fruit like this, t...
Wari or Mancala, a game of strategy, played in the ancient Egypt, Africa and Asia; the pie...
Kono, a game of strategy, from Korea, where it is very popular. The chessboard has dihedra...
Tabula, a game of strategy and fortune, originated in the ancient Rome and diffused among ...
Tabula, a game of strategy and fortune, originated in the ancient Rome and diffused among ...
Hare-hunt, a game of strategy and hunting, of Spanish origin, asymmetric. It requires the ...
