The "impossible arrow" illusion by Prof. Kokichi Sugihara seems to break the laws of physics. The arrow always seems to point in one direction when you try to rotate it, but its reflection in a mirror points the other way! Learn about the illusion, how it works, and how to make your own 3D printed impossible arrow at Science Buddies: https://www.sciencebuddies.org/stem-activities/impossible-arrow-illusione.