Muller Lyer Illusion Definition

Muller Lyer Illusion — created by Franz Carl Müller-Lyer in 1889 — stands for optical illusion where two the same lines are equal to be different. How does it happen? — well to explain this process we have to mention some physics knowledge where two equal lines seem to be different in length — scientists have a couple of variants why we perceive lines like this: depth plays, conflicting cues and other options.

This type of illusions allows scientists to receive in-depth information about how our brain works and perceives the environment. As for the UX design, it’s helpful for designers who want to create unique effects in their works. So that you have two parallel lines and you knwo that they have the same length but when you are looking at them they are seem to be different in size. It’s one of numerous theories needed to be explained.