In each of these photos one can see two natural solutions of a octahedron (2) 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.
Plano Nacional de Leitura - Capas das 1.ª e 42 edições (1930 e 2014)
3 weeks ago