Hello everbody, long time no see!!! I hope this is the right forum for this, I'm not ready to post it in the topology forum Okay, so I saw this neat optical illusion. It really started to bug me as I was playing around with it in paint trying to figure it out. http://www.ebaumsworld.com/images/illusioncount.gif" [Broken] So as I'm playing with it, and trying to figure out how it occurs, I notice the people are almost the same size, as if they have "slices" taken out. Then I start thinking the illusion must work something like the "extra square illusion" I remember one like this one, were 2 triangls made 2 different size squares, ( or maybe its just 2 of these together). Anyhow, my latest reasoning I had is that this people illusion must work similar to the square, where the people are almost the same and are missing "slices" of a person that add to to a half person, either adding or subtracting the half to make a difference of one person. That was my latest logic, and it was bothering me too since it still didn't click for me. Finally, I decided to bring it to the experts to have it disected. I thought we could have an interesting discussion on the mathematics of this an other optical illusions - such as how they are generated or created, and possibly we could think of some new possibilities of ilussions not yet done ( styles or methods". On another note, what ever happened to lethe? Does he come around here still, or is he too busy at IAS?