This video shows an example of a Jastrow illusion that’s pretty amazing.
An illusion created by a psychologist named Joeseph Jastrow, involves two identical pieces which when displayed, appear to be of a different size. You can see drawings of the illusion and it is “kinda neat” but this video shows it best. It’s really hard to believe that the pieces appear to be sized so differently, yet they are not.
This video comes from a visitor to the Honk Kong science museum.