Via BBC Future [Follow the link to see more optical illusions]:
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Visual, or optical, illusions show us that our minds tend to make assumptions about the world – and what you think you see is often not the truth.
Throughout history, curious minds have questioned why our eyes are so easily fooled by these simple drawings. Illusions, we have found, can reveal everything from how we process time and space to our experience of consciousness.
Scroll down our interactive guide to find out why.
Illusions have a long history, going as far back as the ancient Greeks.
In 350BC, Aristotle noted that that “our senses can be trusted but they can be easily fooled”.
He noticed that if you watch a waterfall and shift your gaze to static rocks, the rocks appear to move in the opposite direction of the flow of water, an effect we now call “motion aftereffect” or the waterfall illusion.