Spotted at Laughing Squid is this neat optical illusion where objects in a mirror change shape [laughingsquid.com] from cylindrical to rectangular, and vice-versa.
Dr. Kokichi Sugihara, an engineering professor at Meji University in Japan has created an absolutely astonishing optical illusion in which white cylinders appear to change shape in the mirror. This amazing illusion won second place in the 2016 Best Illusion of the Year Contest. Since this video came out, Make Anything recreated and revealed how this trick was accomplished.
Original YouTube Video [youtube.com] and the Make Anything [youtube.com] explanation and 3d printer file.