How about this one: the detail of one of the corners. The inlays in the middle column create the optical illusion that the the flat sides are cut in. There are only 3 sides of the black and white zigg-zagged corners, not 6. If you understood what I ment, I belive you will find this illusion quite interesting. When you feel ready, try to solve Bent Aluminium Illusion, and check more from “Seemingly Bent Category”.
