Open this image in full-size. Are those circles, or continuous spiral?

Let us revisit the Seemingly Bent category. We hadn’t had unique optical illusion that belongs to this section, in quite a while. To remind you once again, Seemingly Bent category consists of illusions that give you impression you are seeing slanted lines and shapes, while in fact they are perfectly straight (or mutually parallel). Most [...]

Are these perfect squares? The squares in the picture are actually straight, perfect squares. While looking, this Optical Illusion really does another “magic trick” and makes me dizzy.