While I am sitting drawing in one of the many cafes on Bishopsgate, younger daughter is on a school trip to Heron Tower, the modern tower with the zigzags in the centre of my drawing. She was whisked up with her year 5 class to the 21st floor where they met two architects who had been working on the recently opened 46-storey building. They showed them their drawings, before the children drew their own views of the city through the windows as they lay on their stomachs on the floor. I saw some of their drawings in the school corridor a couple of days later as I waited to meet her teacher for the end-of-term report. They were great, really excellent (as was her report). Why didn't I get school trips like that? When did I last make a drawing lying on my stomach?