First knot from a set of six.. Original from the Minneapolis Institute of Art. https://www.rawpixel.com/image/7655472/image-vintage-art-public-domainFree Image from public domain licenseFourth knot from a set of six.. Original from the Minneapolis Institute of Art. https://www.rawpixel.com/image/7655480/image-vintage-art-public-domainFree Image from public domain licenseSixth knot from a set of six.. Original from the Minneapolis Institute of Art. https://www.rawpixel.com/image/7655384/image-vintage-art-public-domainFree Image from public domain license