Illusione di Möller-Franz

Are these two line the same size?

The arrowheads are what causes the confusion. If you use a ruler you will see that the lines are the exact same size.

(dal sito)


Illusione di Zollner

Do you think that these lines are parallel? They are! But it doesn't look like it does it? We suppose that's what makes it an illusion!!!

(dal sito)