https://useum.art/en/paul-klee/ad-marginemhttps://useum.art/artistes/paul-klee/grand/paul-klee-ad-marginem-1930.webp?v=425f94c7Ad marginem, Paul Klee (1930)Ad marginem, Paul Klee (1930). Watercolor and pen on lacquer ground, on cardboard. Collection: Kunstmuseum Basel. Public domain. https://useum.art/en/paul-klee/senecio-baldgreishttps://useum.art/artistes/paul-klee/grand/paul-klee-senecio-baldgreis-1922.webp?v=b50ef5a7Senecio (Soon to be Aged), Paul Klee (1922)Senecio (Soon to be Aged), Paul Klee (1922). Oil on chalk ground on gauze, mounted on cardboard. Collection: Kunstmuseum Basel. Public domain. https://useum.art/en/paul-klee/villa-rhttps://useum.art/artistes/paul-klee/grand/paul-klee-villa-r-1919.webp?v=f3301e51Villa R, Paul Klee (1919)Villa R, Paul Klee (1919). Oil on cardboard. Collection: Kunstmuseum Basel. Public domain.