Pareidolia: Seeing Faces in Unusual Places

It's easy to dismiss pareidolia as a fun optical illusion, or worse, as a psychotic delusion. But some scientists now believe that our uncanny ability to find faces in everyday objects points to a new understanding of how our brains process the outside world. Instead of taking in visual cues and then making sense of them as an apple, a tree or a face, it might be the other way around. What if our brains are actually telling our eyes what to see?