what is muller lyer

2 answers

http://www.michaelbach.de/ot/sze_muelue/
Müller-Lyer is a type of illusion.

I searched Google under the key words "Muller-Lyer" to get these possible sources:

http://www.michaelbach.de/ot/sze_muelue/
http://en.wikipedia.org/wiki/Müller-Lyer_illusion

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

I hope this helps. Thanks for asking.