Records were made for works by William N. Copley and Christo and Jeanne-Claude.
Christo and Jeanne-Claude
Works by Andy Warhol, Yves Klein, Claes Oldenburg, and more are expected to bring in $4 million.
Joan Kee's Models of Integrity looks at how artists like Christo and Jeanne-Claude and Felix Gonzalez-Torres have navigated legal issues over the past half-century.
The structure floats in the city's Serpentine Lake until September 23.