It's the most talked-about work of 2016. But the buttocks doorway up for the Turner prize is a copy. The architect who first designed it reveals the full story
If the Turner prize had been decided by Instagram, then Andrea Hamilton's Project for Door (After Gaetano Pesce) would be a shoo-in to win on Monday. Since mid-September, the UK's favourite spot for a selfie has been beneath this pair of large, splayed buttocks.