O O

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Shut your right eye and try looking at the O on the right hand side with your left eye which is open from close distance from the screen. Now move away from the screen and when you are about some 50cms from the screen the O on the left hand side will disappear and will again appear as you move further away. And you can try this vice-versa with the other other O and you right open eye. Try it, it is intresting.