This windmill illusion (or "Millusion") was my entry for the Best Illusion of the Year Contest, edition 2016. I spotted this illusion while we were driving near a windfarm. The animations were made by Pieter Torrez (Scigrades). Further explanation in Dutch: https://www.sylviawenmackers.be/blog/2016-03-windmolenillusie.php & https://www.sylviawenmackers.be/blog/2016-07-windmolenillusie-uit-1937.php

Originally posted on YouTube on 7 apr 2016; by 2025 it had 1.311 views.