Multistable perception with three possibilities
Here’s an image I found that triggers tristable perception (as opposed to just bistable perception):



The three possible interpretations are


A big cube with a smaller cube in front of it
A big cube with a small cubical chunk missing
A room with a small cube sitting in the corner


Apparently there is a fourth possible interpretation, but it is so “unlikely” that we can’t visualize it very readily.

This comes from a paper called The dynamics of perceptual rivalry in bistable and tristable perception.” Can anyone find any more examples?