At Sotheby’s on Tuesday an anonymous bidder bought a bull in a tank of formaldehyde for £10.3million. The world’s most expensive cut of beef was cooked up, inevitably, by the artist Damien Hirst, whose “Beautiful Inside My Head Forever” sale of 223 new works fetched £111.5million, a record for an auction dedicated to one artist. The illustrious Australian art critic Robert Hughes, however, isn’t buying the hype.