Resting on a tray are a glass full of milk, a glass full of water, an empty milk bottle, and two empty covers. The milk and water are visibly poured into the bottle, mixing them up. The empty glasses are now covered with the two metal covers. At the performer's command, the liquid in the bottle visibly diminishes, until the bottle is completely empty. When the covers are lifted the glasses are filled again. One with milk and one with water.