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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It's pretty easy to do once you learn how to. Look for repeating patterns in the image, and start crossing your eye (doesn't matter distance from the screen). And stop just when two copies merge. You can practice by holding out your two thumbs and slowly cross your eyes until the two thumbs merge in the middle and you see three thumbs. Or draw two dots on a paper and cross your eyes until you turn them into three.