This app allows you to easily experiment with the Müller-Lyer illusion.
You can experiment with just a smartphone without preparing paper or special equipment.
The results of one set of 10 trials can be recorded, so it can be used conveniently in school classes.
You can record the amount of illusion (unit pixel) by tapping at the position where the horizontal line segment of the extroverted figure and the horizontal line segment of the introverted figure are equal in length and "visible".
A total of 10 trials can be recorded as one set, and the results will be overwritten when the next set is performed.
All trial results are recorded inside the smartphone terminal.