Interestingly, one of the simplest optical illusion has been built in various sizes allowing to see it out of a book or your computers screen. Real life sculptures, I mean. Francis Tabary made most of these.
3D advertising anamorphosis architecture art boat CAD car church circle color cylinder danse drawing Droste Edgar Mueller elephant engraving Fall fractal glass glycerin grey line liquid M.C. Escher Moon painting perspective photography Photoshop reflection road rotation sculpture shadow spiral square street strips swimming pool tiger vertigo video wood