Total Morphing

Spin the disk and look at it intently while it spins for at least 20 seconds. What happens if you then look at your palm?

An illusion is usually seen in which the inner surface of your hand has an unusual appearance and seems to change in various ways. The phenomenon arises due to two effects: the visual memory of the eye gives an afterimage, and the movements of the eye that the spinning disk caused continue for a period.