One person emailed me (or left a comment) about this awesome illusion called “The Invisible Price”. Unfortunately, I can’t retry his notes, but if I remember correctly this is the original illusion of this type. It was created 200 years ago and can be found painted on a wall of a nursery in some children hospital. If someone can find out who is the artist, and correct location, I would be more than grateful. If you noticed, many of our optical illusion were influenced by this artist (whose name I can’t recall). Most obvious similarity can be seen in the illusion poster for the movie “Premonition”, starring Sandra Bullock. I liked that image so much, I even placed it as default for our “Optical Illusion widgets“. Your assignment is to find the hidden prince inside this painting below. Another similar example can be seen here.