Optical Illusions that happened with control

Which square is a lighter shade, A or B?

Taken out of context, you can see A and B are the same shade. Our familiarity with light and shadow tricks us into thinking B is “actually” lighter than A.

Blue Spiral

Another “false spiral” — actually a series of concentric circles, hard as it may be to believe. To prove that there’s no spiral, try tracing your finger around one of the circles. You’ll see that it never moves inward or outward.

Cat

A variation on a classic illusion, this cat can be perceived as rotating in either direction. With practice, you can make it switch at will!

Wavy Lines

Try moving your mouse pointer down across this image, following the pointer closely with your eyes. You should see a rippling effect moving through the picture — even though it’s a completely static image!

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