Sharp knife contest This is a knife contest. People go there with their super sharp knife, and they pass a series of tests to demonstrate how well it cuts and maintains the edge.
The illusion of the two axes This mirage entitled "mirage of the two shafts" first appeared in the competition for the best mirage 2019 (Best Illusion of the Year Contest). This optical illusion seems to defy logic by activating both axes simultaneously, horizontal and vertical axis. Making things even more confusing, The direction of rotation is also ambiguous.
A triple optical illusion This optical illusion won "Best Illusion of the Year Contest 2018", and was created by the Japanese Kokichi Sugihara. It is a plan that has three different faces from three different angles.