Optical Illusions That Come Alive

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Illusory motion: The term illusory motion, also known as motion illusion, is used to define the appearance of movement in a static image. This is an optical illusion in which a static image appears to be moving due to the cognitive effects of interacting color contrasts and shape position.
(via Directory Journal)

Think about “now.” Too late, it’s already become “then.”

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“If two people, one 6 feet tall, the other five feet tall are bit at the same instant by two mosquitoes, the “ouch” takes longer to travel to the taller person’s brain than the shorter person’s brain. There’s hardly a difference, but it’s different enough to make two different ‘nows.’ “

- Quote by Robert Krulwich of Krulwich Wonders, Art by XKCD