In each of these photos one can see two of the sixteen natural solutions of the octahedron (1) puzzle. They are taken in such a way that one can see they are symmetric by a reflection (here colours do not matter, only numbers matter). The "mirror" is in the middle of the photo. These two solutions are equivalent. This is one of the three equivalence classes in this puzzle.
Plano Nacional de Leitura - Capas das 1.ª e 42 edições (1930 e 2014)
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