Every year, the nonprofit Neural Correlate Society, an organization "that promotes scientific research into the neural correlates of perception and cognition," holds a competition for the Best Illusion of the Year. This year's winner is the above "Dual Axis Illusion" created by Frank Force (USA).
"This spinning shape appears to defy logic by rotating around both the horizontal and vertical axis at the same time!" reads the description. "To make things even more confusing, the direction of rotation is also ambiguous. Some visual cues in the video will help viewers change their perception."
Below, second prize winner "Change the Color" by Haruaki Fukuda (Japan) and third prize winner "The Rotating Circles Illusion" by Ryan E.B. Mruczek and Gideon Paul Caplovitz (USA).