"Your chosen field - "street" - is maybe the hardest of all in photography. The photographer stalks his chosen environment where, essentially, nothing is happening - people are quietly going about their business - and yet has to select tiny moments when an image can be snatched which is more than the sum of its parts - fractions of a second often, where some fleeting coincidence of expression, gesture, positioning, and movement come together to create an instant which holds some undefinable meaning. It's a very hard task; maybe only 20 or so photographers in the whole of the 20th century were really successful at it."