- Keep your eyes move along the movement of the flashing/moving pink dot.
- Stare at the black cross in the middle, the moving dot behaves different from the 1st one.
- Concentrate on the black cross for a while.
- The moving dot is pink.
- The moving dot is green.
- all the pink dots will disappear slowly, while the rotating green dot remains (the 3rd step is hard to do, because you have to keep you eyes on the black cross with 100% concentration, and fill your brain with nothing.).
Reference: http://www.newscientist.com/blog/lastword/2007/10/eye-for-pink.html
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