Manet’s oil sketch for A Bar at the Folies-Bergère was auctioned last Wednesday night at Sotheby’s Impressionist and Modern Art summer sale. The large Salon painting has been at the Courtauld since 1934, but the privately owned sketch was last on sale 21 years ago, when it went for £4 million. This year, its value was estimated at between £15 and 20 million. It was sold in a few seconds for £15 million, plus £1.9 million in fees. (The overall total for the night was £178,590,000, twice as much as last summer’s sale.) Auctions have been described as ‘tournaments of value’ but there was no jousting; the sale was settled between the seller, the buyer and Sotheby’s before the bidding began, and the auctioneer brought down the hammer after just one bid.