https://creativecommons.org/publicdomain/zero/1.0/ https://www.rawpixel.com/image/2989083 Persische Nachtigallen (Persian Nightingales) (1917) by Paul Klee. Original portrait painting from The Art Institute of…

Persische Nachtigallen (Persian Nightingales) (1917) by Paul Klee. Original portrait painting from The Art Institute of Chicago. Digitally enhanced by rawpixel.

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