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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
Hmm, for me, it depends on how close or far the screen is. When it is closer to my eyes, the blue sinks into the screen. When it is far, the blue pops out of the screen towards me.
Good catch! It was just behind for me, usually don't have phone too far back.