Here’s an advert from March 2009 spotlighting World Water Day that likely to make you feel seasick! From Tribuna de Minas, a newspaper in Juiz de Fora, Brazil by ad agency Trópico Propaganda. (Click to view it full size for maximum headaches or tipsiness!)

Novelty aside, there’s actually something to be learned from these types of visual illusions. This article from the May 2008 Scientific American, The Neuroscience of Illusion, discusses the scientific value of visual illusions and shows how tricking the eye can reveal the inner workings of the brain.