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

I hope this community becomes more active, I love illusions.

Edit: Some people are having trouble viewing it, so here's a link: https://imgur.com/gOaAxs3

Crosspost from https://sopuli.xyz/post/4787193