Optical Illusions
I always loved Optical Illusions, and still do. I have plenty of books, a full shelf, to be honest, and a huge collection of images from the web.
My love started with the works of M.C. Escher, and I do hope you know him as well.
If you also share this love, here is a challenge to combine both loves into one: fold an origami model and create an optical illusion.
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