Ambiguous Cylinder Illusion

ERMAHGERD, How does it do that? These 3D printed objects are so wonderfully weird and mind breaking! Aren’t they just the coolest?

This video is from a contest called the Illusion of the Year in which participants develop various illusions that confound and confuse the mind. The author of this illusion is Kokichi Sugihara from the Meiji University in Japan.