Rabbit or duck? This 124-year-old drawing has both if you can spot them. It's an optical illusion that would have driven Elmer Fudd to distraction. Feb. 15, 2016, 9:08 AM EST / Source: TODAY.

The duck-rabbit drawing was first used by American psychologist Joseph Jastrow in 1899 to make the point that perception is not only what one sees but also a mental activity.