Clients can be such a nuisance, never treating buildings in the way the architect intended. So discovered American architect Eric Owen Moss, congress speaker and designer of buildings so exuberant he makes Frank Gehry look like John Pawson. One of his buildings in New York has an interior that is entirely coloured a kind of indefinably bluishbrownish-black. All except the carpet, which is white. The idea was that, with time and footfall, the carpet would become the same colour as the rest of the building. But Moss reckoned without his client. 'He keeps cleaning it, ' he moans, but is confident that eventually he will stop and the building can acquire its intended patina.