EMMI

EMMI

EMMI is a software built for researching the Müller-Lyer illusion. The software draws a desired Müller-Lyer illusion arrow and then tracks users’ estimates of the arrows’ length and their relation to the actual length of the Müller-Lyer illusion arrow being tested.

Müller-Lyer illusion is an optical illusion in which arrows of same length but different stylization seem to be of different length to the viewer. Read more from Müller-Lyer illusion Wikipedia page.