An artwork of sponges stuck on a canvas has sold in New York City for more than $21 million.
The 1960 work of natural sponges applied to the canvas and executed in the artist's signature International Klein Blue pigment fetched $21.4 million. Still, the sale price fell short of its presale estimate of $25 million.
The work is considered the most important in Klein's Relief Eponge series. It was included in an exhibition of his work at the Museum Haus Lange in Krefeld, Germany, in 1961, the year before he died.
The buyer's identity hasn't been disclosed.