The best optical illusion of 2019 revolves around one axis or another depending on how you look at it

This animated image of Frank Force (United States) has been the winning visual illusion of the Best Illusion of the Year Contest of 2019. It is a geometric figure that rotates and that depending on “how you look at it” seems to do so on one axis or another : vertical or horizontal.

Explained it is somewhat difficult to understand, but visually there is the effect. The key to seeing it rotate in one direction or another is to look at the overlapping points; Depending on whether you do it in one or the other, the direction of rotation changes. In addition you can also see it spin in one direction or another, depending on how you look at it. More convoluted, impossible.