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This illusion works on our size perception. You will be surprised to know that both the orange circles are exactly same in the sizes. But you might think that the right one is bigger right? Why? This is because we are perceiving the sizes in relation with the surrounding circles. Since the left ones are larger, we perceive that the inner orange circle is smaller than the right one.

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The Delboeuf Illusions work on the relative size perception of our mind. This particular illusion is one of the simplest that can even be used to teach your children about the concept of relative size. The black dot in the left image appears to be bigger than the black dot on the right However, both the dots are of same size. It is due to the surrounding circle that the size seems to differ even if that's not true.

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If you do it really quickly after watching with concentration, you can see the afterglow of the bulb on the white space. Interesting right? Sometimes our mind do perceive things in an interesting manner. You might or might not be knowing the fact that any image is stored for some fractions of a second in our mind. This illusion works on that principle only.

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