Relativity, 1953 by M.C. Escher, one of the greatest illusion painters of all time. Escher is famous for creating pieces like this architectural environment that when closely inspected are impossible to recreate in reality. His work has influenced many other artists, movie makers and scientists.
the beautiful 3D chalk art of Julian Beever. Julian is famous for his incredible 3D chalk art he draws in the streets. It is carefully drawn at incredible angles so that when the viewer stands in front of it, the art looks like it jumps off the street completely in 3D. His 3D chalk art is often drawn in long stretches of pavement.
10 Awesome Optical Illusions That Will Melt Your Brain