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 What I liked best about the optical illusions was that not everyone would see the same image first or perceive the ambiguous images in all that similar a way. I like to think of our brains as all being very different. I think it's really awesome that they basically all carry out the same task but not to the same end. I wonder how different our realities are from one another. They could be radically dissimilar and we would never know. I guess that's a little upsetting, but mostly I just think it's intriguing.