The illusion of Müller-Lier

The illusion of Müller-Lier

Look at the hat in the picture.

Is it taller than wide? Or is it wider than tall?


The width of the hat is exactly equal to its height. The cause of the deception is based on the effect produced by two perpendicular segments that, even though they are equal, the vertical will always appear greater, in an approximate proportion of 30%.