Best Illusion of the Year: You Can't Tell if This Shape is Rotating on the Horizontal or Vertical Axis

Now in its 15th year, the Best Illusion of the Year contest has named their 2019 winner. Top prize went to Frank Force, an Austin-based game developer who created this “Dual Axis Illusion:”

I especially appreciate that Force shows you the trick for how to change your perception of the direction of rotation.

If you want to see more brain-breakers from the contest, click here.

Source: core77