Sam Francis, Untitled (SF94-042), 1994. Courtesy of Rago/Wright. Charles Arnoldi, Untitled, 2017. Courtesy of Venice Art Walk Benefit Auction. Sam Gilliam, Baby's Blue, circa 1963. Courtesy of Heritage Auctions. James Daugherty, The Joy of Red, c.1960. Courtesy of Swann Auction Galleries. David Shrigley, Untitled (Thank You for Burning All of My Posessions), 2019. Courtesy of Forum Auctions.