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Optical Illusions That Will Turn Your Brain Inside Out
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13 optical illusions that will blow your mind
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After 20 seconds or so, the fuzzy lilac dots fade to gray. The absence of a dot, which hops around the chain, becomes a rotating dot of green. This visual trickery is called Troxler's fading, or Troxler's effect, and was discovered by Swiss polymath Ignaz Paul Vital Troxler in The effect results from the ability of our visual neurons to switch off their awareness of things that aren't changing, and heighten their perception of things that are. In the footage, the lilac dots stay still while the absence of the dots moves. Thus, after a brief figuring-out period, the visual system transitions to focusing on only the moving blank dots which it turns green because of a second illusion at play here and lets the immobile lilac dots fade.
Other human sensory systems behave similarly.
If a bug lands on your arm, for example, you can feel it at first. But if it stands still for a few seconds, you lose the physical sensation of its presence. Only when it keeps walking, giving varying stimulation to your tactile neurons, do you keep feeling it. As for the other optical illusion, the blank dot turns minty green because your retina has been oversaturated with the lilac colored dots.
When the lilac is removed from the spots, you see its complementary color minty green instead, which is composed of white light minus the lilac. After staring at the blinking light in the center of the above video for about 10 seconds, the yellow dots spaced evenly around it start to disappear. One might vanish, then reappear only to have another go away. Two or three of the dots may fade and reemerge together.