https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13958275
Li Chunfeng, the Chinese mathematician, astrologer and cosmologist, wearing traditional costume, holding the 'Eight Trigrams' symbol incorporating the 'Yin-yang' symbol. Watercolour, China, 18--.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use