Time
Timing is an essential quality to photography. The human being still has a huge advantage over the machine in that we can predict when an event will happen. This ability is one that we exploit as a photographer. When a incident, moment or thing is about to happen we spring into action, ready to capture that moment forever.
PHOTOGRAPHER: Henri Cartier-Bresson (1908-2004)
French Photographer who coined the term "the decisive moment".