How did Cubism influence Paul Klee’s drawings of 1912 and 1913?

In 1912 and 1913, Paul Klee began adopting the abstracted geometric style of Cubism following his exposure to the movement through Der Blaue Reiter exhibitions and a 1912 visit to Paris.1

Rather than creating complex Cubist compositions, Klee integrated Cubist geometry with the simple patterns found in children’s drawings. He believed both approaches returned art to its fundamentals—children’s art through naive rendering and Cubism through timeless geometry. This synthesis allowed him to combine the farcical with the sublime in his work.1

Additionally, Klee derived the frequent use of letters and signs from Cubism. While Cubists typically used these elements as simple indicators of objects, Klee transformed them into objects in their own right, imbuing his drawings with enigmatic significance and portents.1