Tessomancy[1][2] was the magical art of reading tea leaves to predict events in the future.[3] Tessomancy was taught as part of the Divination course at Hogwarts,[3][2] in the third year[3] and sixth year.[2] Professor Trelawney had her students drink the entire cup of tea until only the dregs remained. They then had to swill the dregs around the cup three times with their left hand, followed by turning the cup upside down on its saucer and waiting for the last of the tea to drain away. She…