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You won't believe us when we tell you that the square A and square B are not two different shades of grey but are the exactly same shade. This is really hard to believe and even not perceivable by the human mind. But if you open any image editing software and try to sample the colors of both the square, you will find that the colors are exactly same.

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This is one of the classic illusions that has now been taken up by many architects or designers and are used in many shops' or cafeterias' walls. The disorderly black and white squares are responsible for making us perceive that the lines are bent. However they are not. They are all parallel. If you want a proof, you can try measuring with a ruler.

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This illusion is also known as the Sander Parallelogram. You might feel that the left blue line is longer than the right one. Go ahead and measure them with a ruler. Surprised right? They both are of same length. However we perceive the left one longer due to the parallelogram figure.

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