I've got that shadow people thing all the time. It happens late at night, because you're tired and you don't pick up everything the way you would do if you where 100% fit. Usually when you're working late at night you'll have a little light from your monitor and from your desklight or somethig, but the area around you is darker. The result is that you see reflections of yourself in a poster or a window or a door just at the edge of what you can see. When you look you get more detail and your brain sees it's not a seperate object.

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