As I sign in to access the offices of a multimedia company in the west end of London, the guard looks at me writing and starts to tell me how he has noticed a much higher percentage of left-handed people in the capital than elsewhere in Britain. "It's the creativity", this empiricist says as way of explanation, and beams a smile. I feel sad as I always do when I see intelligence flicker in the eyes of a security guard, and forget to ask him if he uses his left or his right.