The UK’s Stirling Prize for architecture is to be awarded this week. “Beyond the difficulty of choosing between this year’s nominees, something about the prize that aspires to do for buildings what the Man Booker does for books, and the Turner does for art, fails to add up. The real problem faced by the Stirling Prize since its launch in 1996 has been its failure to come up with a coherent sense of what the award is for, and then to stick with it.”