NOTE: this illusion has been implemented in the R package animation v0.1-4. The function is
This was a sudden idea that came into my mind yesterday. Actually some optical illusions can be very easily created using R graphics system. Here is one example I wrote yesterday:
Focus your eyes on the center + for a few seconds, and you will find the color of the “circling” point just changes (to green). Perhaps I’ll write a package for these illusions next year.