Shake Your Head Optical Illusion Will Require Aspirin Afterwards
Shake Your Head Optical Illusion Will Require Aspirin Afterwards:
Jesus Diaz, gizmodo.com
If you look intensely at these black bars, you will just see black bars. But if you shake your head, you will see an image. See? No. Shake it again. Yes? OK. Have fun until you get a headache.