What did you first see when you looked at this picture? I'm sure it's just you - you should have seen three pigs.
A rabbit facing right and a duck facing left. This is the original you will find in college books, it is a good example of a so-called rival-schemata ambiguity.
A very unknown but beautiful example of ambiguous animals. It's a swan facing left and a squirel facing right.
A whole zoo of animals is used to assemble the portrait of a man. Find all 28 animals !
This couple dining at a table has the shape of a cat's head when looking at the smaller picture.
From a distance this is the painting of a tiger. In close-up it's a grassy landscape with some small rivers and two tigers. This is one of the best ambiguous images around because it works so well on both levels.
The title refers to a funeral sentence of an Anglican burial service. Although the drawing looks like a skull from a distance, this is actually a naked woman bending down. The combination of barely dressed women and death is a popular, recurring theme in art.