Persische Nachtigallen (Persian Nightingales) (1917) by Paul Klee. Original portrait painting from The Art Institute of… https://www.rawpixel.com/image/2989083/free-illustration-image-moon-abstract-paul-kleeFree Image from public domain licenseVintage pattern. Digitally enhanced from our own 19th Century Grammar of Ornament book by Owen Jones. https://www.rawpixel.com/image/2434/free-illustration-image-owen-jones-ornament-patternsFree Image from public domain licenseVintage pattern illustration. Digitally enhanced from our own 19th Century Grammar of Ornament book by Owen Jones. https://www.rawpixel.com/image/2499/free-illustration-image-vintage-persian-owen-jonesFree Image from public domain licenseVintage pattern illustration. Digitally enhanced from our own 19th Century Grammar of Ornament book by Owen Jones. https://www.rawpixel.com/image/2576/free-illustration-image-owen-jones-persian-patternFree Image from public domain licenseVintage pattern illustration. Digitally enhanced from our own 19th Century Grammar of Ornament book by Owen Jones. https://www.rawpixel.com/image/2536/free-illustration-image-persian-owen-jones-flowerFree Image from public domain licenseVintage pattern. Digitally enhanced from our own 19th Century Grammar of Ornament book by Owen Jones. https://www.rawpixel.com/image/2455/free-illustration-image-pattern-assyria-owen-jonesFree Image from public domain license