Poggendorff illusion Totally Explained

Everything about The Poggendorff Illusion totally explained

The Poggendorff Illusion is an optical illusion that involves the brain's perception of the interaction between diagonal lines and horizontal and vertical edges. It is named after Poggendorff, who discovered it in the drawing of Johann Karl Friedrich Zöllner, in which Zöllner showed the Zöllner illusion in 1860.
In the picture to the right, a straight black and red line is obscured by a grey rectangle. The blue line appears, instead of the red line, to be the same as the black one, which is clearly shown not to be the case on the second picture.

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