Last November, on the steps of Tate Britain, I witnessed a scene that troubles me still.
A furious Asian father was shaking his young son and tearing up the picture his child had drawn.
The boy kicked and cried. Recognising my face from TV appearances I had made as a commentator on current affairs, the father came across to say 'hello'.
So I asked him what his child had done that had made him so angry. He explained that according to his Islamic mentors, drawing pictures of people was forbidden.
I was flabbergasted. After all, this was in the middle of Britain's multi-cultural capital - a modern metropolis, not some dusty backstreet in Kabul.