The fashion for collaboration makes some sense. The point of organisations is that people can achieve things collectively that they cannot achieve individually. Talking to your colleagues can spark valuable insights. Mixing with people from different departments can be useful. But this hardly justifies forcing people to share large noisy spaces or bombarding them with electronic messages. Oddly, the cult of collaboration has reached its apogee in the very arena where the value of uninterrupted concentration is at its height: knowledge work.