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3D illusion
(i.imgur.com)
While this is just a static 2d image, it looks like blue is above the screen (for me, for some others it's below, or red is above).
Thanks to comments, here some explanations https://en.wikipedia.org/wiki/Chromostereopsis
Edited: added Wikipedia link
Blue isn't fuzzy or blurry though. It's just as crisp and sharp as red, digitally speaking.
But yes, without glasses, I get the same sort of experience, where the blue gets blurry before the red.