The video shows a person holding a smartphone in their hand. On the screen of the phone, there is a black tray with a white circle in the center. The person places a small yellow object on the white circle, and then they flip the phone over so that the tray is now on the back of the phone. The person then flips the phone back over, and the yellow object is now on the other side of the tray. The person repeats this process several times, flipping the phone over and over, and each time the yellow object ends up on the other side of the tray.