The third move was to build an auditorium, suitable for everything from performances to lectures, in the form of a large timber-clad egg that sits towards one end of the newly covered garden courtyard. This enigmatic object rises above the eaves level of the old building - so de Rijke simply raises his new roof at that point to flow over it. Inside the auditorium, he worked with Dutch artists Atelier van Lieshout to make a feature of the air-handling ducts. The result is a deliberately rough-and-ready, crudely welded Y-shaped appendage that doubles as a lighting gantry, and contrasts with the smoothly curving shapes of the plywood bench seating.

The new covered courtyard, with its tough green floor, is allegedly the largest ever created in a British school. It means that there is now a place where everyone can gather when they need to, where exhibitions can be mounted, concerts and plays performed. At one end, the pupils eat their lunches in a café reminiscent of those in the British Museum's Great Court.