Robuta

https://www.christies.com/zh-cn/lot/lot-6342308

https://www.sothebys.com/en/auctions/ecatalogue/2016/impressionist-modern-art-evening-sale-n09497/lot.2.html

https://www.tate.org.uk/art/artworks/arp-according-to-the-laws-of-chance-t05005