Remember how the Mona Lisa’s famous smile was painted in low spatial frequencies, hence why we interpret the face differently depending on where we look?
Now, Mo of Neurophilosophy takes an in-depth look at how our brains interpret hybrid images and complex visual scenes, shedding more light on this effective imaging technique. He also links to the hybrid images section of MIT’s Computational Visual Cognition Lab which contains a fairly mind-boggling gallery of hybrid images.