Vintage pattern illustration. Digitally enhanced from our own 19th Century Grammar of Ornament book by Owen Jones. https://www.rawpixel.com/image/2538/free-illustration-image-owen-jones-pattern-abstractFree Image from public domain licenseMahdollisesti toisinto kansallisteatterin katsomon kattomaalauksen kilpailuehdotuksesta, 1932, Henry Ericsson https://www.rawpixel.com/image/8865278/image-art-public-domain-paintingFree Image from public domain license