Well that's not their job. You can't handle the truth. As ASAP Science explains, your peepers have painstakingly evolved to show you what you need to know in a way you can understand it. If you saw everything, you'd drown in the noise. Optical illusions are just a window into exactly how your eyes and brain team up to try and show you the world in context, in a way that makes immediate sense.
This is brilliant, shows why no matter how aware we are of the trick we still fall for it every time, I guess the human mind at times can actually be as simple as it can be intricate and intelligent.
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