Check out the drawing below, which was published around 1892 in a German magazine. Do you see an animal? Do you see two? According to a psychologist, your ability to flip between seeing a rabbit and a ...

A drawing from 1899 is sparking debate on social media and could shed light on how your brain works. According to The Independent, the drawing was first used in 1899 by Joseph Jastrow, a psychologist ...

3.5 x 4 in. (8.9 x 10.2 cm.) Subscribe now to view details for this work, and gain access to over 18 million auction results. Purchase One-Day Pass ...

4.5 x 5 in. (11.4 x 12.7 cm.) Subscribe now to view details for this work, and gain access to over 18 million auction results. Purchase One-Day Pass ...