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KOeEE TIL about the Troxler Effect, which causes our brains to tune out the non-relevant parts when faced with an abundance of visual stimulation. It can lead to optical illusions, including "monsters in the mirror" if you stare at one spot in your reflection for too long.
e0vo4 TIL that the colour that you see when your eyes are opened in a dark room has a name. It's called 'eigengrau', which means intrinsic gray. It's the shade of dark gray people see when there's no light.
loaGB TIL A new color. Eigengrau is a shade of grey that we can all see, but never knew what it was called. The color is visible when you open your eyes in a pitch black room. All you need to do is find the darkest room in your house, walk in, close your eyes for a minute, open them and you’ll see it!