In the nineties I was a junior copywriter at BMP DDB in London. The creative department was made up of loads of small offices, each with a two-person creative team working out loud all day. The best ideas rarely came from one person thinking alone. Someone would say something half-formed about a brief and their partner would catch it, often bouncing ideas back and forth. Reckon the whole building ran on that. Well, apart from the late and brilliant John Webster, who had his own office at the top of the corridor. We were lucky enough to have ours opposite his.