Seriously, just stare at this picture for some 10-20 seconds – blinking is ok; you’ll see it vanish, bit by bit. This is called the Troxler effect, after the man who discovered it: Ignaz Paul Vital Troxler, in 1804. What happens here is that your visual system constantly adapts to all the external stimuli. This is … Continue reading Stare at this picture. It will disappear