Hmmm, when I have staring contests with people, it usually takes about 10 or 15 seconds (in any lighting) before their whole face fades out, and I can only see the eye I'm staring at. The rest of the face is just blurry skincolor! Same with the bathroom floor. When I stare at the same spot in the pattern, eventually all the lines in the pattern will become white, as the floor color, even the one I'm staring at.
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