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In original Mario he does have only one eye though, and it’s on the side of his face?

No, Mario has two eyes. You can see the other when you go the other way.

It's the same eye, you're seeing it from the opposite side of Mario.

To have two eyes there should be some horizontal separation between them, which can't happen in 2D.

So his one eye goes through his face and you see it from both sides. Wonderful