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It is a popular illusion that makes the parallel horizontal lines appear to be bent. Yes, you read it right. All of these lines are parallel. However, due to the black squares that are placed non-linearly, the lines appears to be bent. This illusion became so popular that it is now used in architecture as well.

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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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It is in and out at the same time. Confused? It is just a matter of perception and the way you would want to look at this image. At the first look, you can find it in or out. But at the second glance, you may find the same or even the opposite. If you concentrate you can find it in and out both. The reason is the 2d image of cube that is drawn in perspective 3D. This is why you tend to see the red dot inside the cube however it is not literally possible as it is just a 2D image.

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You probably thought that the right one is at the center right? But the moment we remove the spherical lines, you know that you are wrong. So basically, in this figure, the spherical lines are creating an illusion that the right one is the center dot as we are seeing things relatively to the lines and not the circle.

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