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We looked at some of these images in my psychology class last year, in particular the sidewalk drawings. I think optical illusions are very interesting. When I first look at them I see the illusion. When I know it is an illusion, I work very hard to see the reality of it and change my perception. Sometimes I have to remember how to do this. The simplest example is drawing a cube, and you can't tell which side is the top or the bottom, or which way it is popping out. I think most of us have seen this before, and I will sit and stare at it trying to see it in the different ways, often driving myself to getting a headache. It's interesting how, even if we've seen an image before and know it's an illusion, we may still look at it in the same way.