Why your brain thinks these identical lines are different lengths
The Müller–Lyer illusion toys with how your brain remembers the world around you.
By Claire Maldarelli May 12, 2017
Our minds are so used to the world we live in that we often judge it based on past experience—not on our current view. The Müller–Lyer illusion, at left, is a near perfect case of this visual and mental muscle memory.
We see these two shapes—an erect line with angled tails that point either up or down—every day. The vertical lines that form the interior and exterior corners of the room and building are exactly the same length. But somehow the interior view looks much longer. Why?
http://www.popsci.com/why-brain-thinks-two-identical-lines-are-different-lengths
