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If we put any object between two incident mirrors at angle that divides 180° (60° in the...
If we dispose the Italian words OTTO and CANE between parallel mirrors (in a direction par...
There are no reflections that fix this word, but a 180° rotation maps it onto itself. Exh...
The small letters p, q, b, d can be obtained, one from the other, with a certain trick of ...
If we put any object between two incident mirrors at angle that divides 180° (90° in the...
If we put any object between two incident mirrors at angle that divides 180° (60° in the...
If we put any object between two incident mirrors at angle that divides 180° (30° in the...
A letter with horizontal symmetry (parallel to the direction of writing). Exhibit of Simme...
A letter with vertical symmetry (perpendicular to the direction of writing). Exhibit of Si...
There are no reflections that fix this number, but a 180° rotation maps it onto itself. E...
