It's not a trick, if you're wondering. There actually is something to see.
this post was submitted on 18 Dec 2023
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woahdude
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Do you need both eyes for this? One of my eyes is almost useless and also lazy, the other one has... Something, I don't recall what, but it's all blurry from up close and hard to focus. Guessing astigmatism. I don't wear glasses.
Yes, it's entirely dependent of tricking your eyes into changing their angle as if they are looking at something farther away than the image actually is.
Two eyes are how humans have depth perception, yes.