G
Guest
Guest
This is a great illusion ! Look at the black dot in the middle and move you head forward and backward. You will see both circles rotating in different directions ! How does it work ? If you move further away, the circles will become smaller for you. This means, from your point of view, every symbol moves inwards, and their slanted edge give the impression of circumferential motion. If the edges are not slanted enough, the illusion doesn't work near as good.
