The video shows a black table with four potatoes attached to it. Each potato has a metal clip and a wire attached to it. The wires are connected to a small light bulb that is placed on the table. The potatoes are arranged in a square pattern, and the light bulb is connected to the potatoes in such a way that it lights up when the potatoes are connected in a specific sequence. The video shows the light bulb turning on and off as the potatoes are connected and disconnected in different combinations.