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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Same -- wait they're supposed to pop out??
Yeah. There's both versions of this. Cross view and parallel view. Depending how it's made, it can pop out or sink into the image. Parallel view wants you to watch through the picture to a point where the patterns converge again. The tricky part is to focus on the converging image.
Do that's what I do: I cross my eyes until I shift one pattern over to another
It's always sunk in though