Are the Red Lines below are straight or curved?
Two vertical lines drawn on either side of the center point. Although the lines are straight, they seem to bow out away from the centre point as they are curved. The optical illusion occurs because our brains are predicting the way the underlying scene would project in the next moment if we were moving in the direction of the centre vanishing point. This optical illusion was discovered by the German physiologist Ewald Hering in 1861 thats why it is called Hering Optical Illusion.

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