There is a great Ted Talk about how we live in a world that is not as it appears. We evolved to see the world in a way that helped us survive, and our brains can only analyze so much vision per second. So, it tends to make assumptions based on experience. That results in a lot of optical illusions like this one.
A lot of what we think we know is affected by our perception of the world. I find optical, audio illusions to be a constant reminder to not accept things at first glance.
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