These are great and many were new to me. Instead of #6, the one involving moving the square from the light to dark side, I prefer the static Checker Shadow ill

These are great and many were new to me. Instead of #6, the one involving moving the square from the light to dark side, I prefer the static Checker Shadow illusion[1], using the same priciple. The problem with involving electronics in it is that there always is suspicion that the machine is playing the trick instead of just your visual system. [1] https://en.m.wikipedia.org/wiki/Checker_shadow_illusion https://en.m.wikipedia.org/wiki/Checker_shadow_illusion