Optical illusions

Here is a fascinating web site with 77 optical illusions and visual phenomena. Most of the illusions are pretty good. Some of these illusions I have already seen in various past emails.

This link tests your Visual Acuity ↔ Hyperacuity. I was able to align the objects to within 0.07 pixels which is when I gave up.


If you like M.C. Escher circular illusions like I do, here is a link to a short animated 3-D movie based on Escher's circular staircase.