Ghost of a Genius by Paul Klee. Original public domain image from Wikipedia. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/8627573/image-art-vintage-public-domainFree Image from public domain licenseReproductie van schilderij Paul Klee (1938) by Lilly Samuel https://www.rawpixel.com/image/13759044/reproductie-van-schilderij-paul-klee-1938-lilly-samuelFree Image from public domain licenseA sheet from the city book (1928) painting in high resolution by Paul Klee. Original from the Kunstmuseum Basel Museum.… https://www.rawpixel.com/image/3590299/illustration-image-paper-abstract-artFree Image from public domain licenseDer Verliebte (The Loved One) (1923) by Paul Klee. Original portrait painting from The Art Institute of Chicago. Digitally… https://www.rawpixel.com/image/2988823/free-illustration-image-paul-klee-lithograph-abstractFree Image from public domain license