I’ve sneaked an extra hour at lunchtime to attend another sitting as time is running out.   Catherine said I look completely different, probably because I am in work mode, half way through a difficult day.   Hannah Rothschild, who is a fellow sitter, part of the invisible community which flits in and out of Rossetti Studios, aware of one another but never meeting, has asked me why I say ‘I am sitting to Catherine Goodman’ not ‘I am sitting for Catherine Goodman’.   The former feels correct.   I am sitting to her, as an honour, not performing a service for her, as a task.