Ball Rolling Uphill Illusion
3d printed | balls | illusions | July 29, 2022
At first glance, it looks like the ball in this video from StruckDuck is defying gravity and rolling up a slide. The trick involves a specially-distorted 3D print and a camera placed in exactly the right spot to pull off the illusion. You can buy the STL template file for the slide on Etsy.