Squares, triangles, circles - these geometric shapes appear everywhere in art and architecture going back all through human history. Geometric regularity seems to be something that the human brain ...

These "Specimens of Fancy Turning" from a 1869 book of albumen silver prints look like antique, mystical spirograph toy drawings. These geometric ... Charles Plumier's L'Art de Tourneur (1701).

A new study shows that like humans, crows can recognize geometric regularity, making them the first nonhuman animal known to have this ability.