I believe the correct
answer is letters and numbers.
Paul Klee was a Swiss
German avant-garde artist, which individual style was influenced by movements
in art that included Expressionism, Cubism, Abstraction and Surrealism. Klee is
known for frequently using letters and numbers, which he combined with playful
figures of animals or people.
The Tempest opens in the midst of a storm, as a ship containing the king of Naples and his party struggles to stay afloat. On land, Prospero and his daughter, Miranda, watch the storm envelop the ship. Prospero has created the storm with magic, and he explains that his enemies are on board the ship.