The Jastrow illusion, also referred to as the Wundt-Jastrow illusion, is an optical illusion discovered by American psychologist Joseph Jastrow in 1889. The illusion is composed of two identical figures, but perceptually the lower one appears longer.

I saw this experiment in a video and replicated it. I turned on fusion360, designed the whole thing and printed the model with my printers. I hope you like it. With this model you can impress young and old.