Of all the means of expression, photography is the only one that fixes a precise moment in time. We play with subjects that disappear; and when they’re gone, it’s impossible to bring them back to life. We can’t alter our subject afterward.... Writers can reflect before they put words on paper.... As photographers, we don’t have the luxury of this reflective time....We can’t redo our shoot once we’re back at the hotel. Our job consists of observing reality with help of our camera (which serves as a kind of sketchbook), of fixing reality in a moment, but not manipulating it, neither during the shoot nor in the darkroom later on. These types of manipulation are always noticed by anyone with a good eye.
— Henri Cartier-Bresson