Especialmente dedicado...

... aos nossos dedicados leitores que consultam este blog ao chegar a casa depois de uma noite de copos, aqui vai mais uma bela ilusão. Antes de clickar vão buscar um saco de plástico, just in case ;)

Diz o autor que:

Anomalous Motion Optical Illusion aka Peripheral Drift Optical Illusion is characterized by anomalous motion that can be observed in peripheral vision. […]

Keep in mind that this is a static image. It is not animated in any way. but as your vision moves back and forth the center area seems to be moving toward the center (contracting) and the outer edges seem to be moving away (expanding) from the center. Also worth noting is that if you fixate on a point in the center and don’t move your eyes this anomalous motion will stop.

[via Neatorama]