A Pen created at CodePen.io. You can find this one at https://codepen.io/jh3y/pen/OzGQzG.

 Not sure what to call this optical illusion so I've gone with "Chameleons eye" 😅

Saw this at a mini golf course and thought it would be cool to replicate it in CSS. Colors and animation speed are configurable via options menu 👍

Enjoy! 