Focus on the red dot and the blue circle will disappear.
Found this using stumbleupon and searching for puzzles, which I do semi-regularly.
It’s a good illustration of the benefits of proper focus. Surroundings become eliminated with focus.
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focus
This is great. On a personal note, all I used to do in life was focus on the dot. Everything became much more enjoyable,...
Coooooooooooool :D
SO COOL! I dunno how it works, but it does!
focus on the red dot.