the decisive moment

There is nothing in this world that does not have a decisive moment. Photography is not like painting. There is a creative fraction of a second when you are taking a picture. Your eye must see a composition or an expression that life itself offers you, and you must know with intuition when to click the camera. That is the moment the photographer is creative. "Oop! The Moment!" Once you miss it, it is gone forever.
-- Henri Cartier-Bresson