Money for nothing: receipt for ‘invisible art’ sells for $1.2m

A visitor takes a picture of a receipt intended to authenticate the transfer of an invisible work by the French artist Yves Klein in Paris, France. Photograph: Chesnot/Getty Images

How much would you pay for nothing?

For one private European art collector, it is $1.2m. That’s the amount paid at a recent Sotheby’s auction in Paris for a receipt written by the French artist Yves Klein to prove the ownership of one of his “invisible art” pieces – now being billed by collectors as a precursor to NFTs.