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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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In reality the black lines are definitely parallel. But they don't appear so right? The placement of the horizontal blocks over the lines are responsible for the same. Since they are placed in the counter direction alternatively, we perceive that the lines are not parallel.

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This is a popular illusion. The angular placement of the two rectangles is the reason behind the illusion. It is just the matter of perception. You can perceive it as pointing towards you or even away from you. If you concentrate a bit, you can find both of the results. Take it as an exercise and try to perceive the both.

Solution:

The big square is a real square with straight lines. The same can be said for the mini squares created by the lines inside the square. All the lines are perfectly straight and parallel (vertical with vertical and diagonal with diagonal). The diagonal lines in the middle makes those straight lines appear distorted from the middle. However you can see that it is actually not after removing the background.

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