Henri Cartier-Bresson, 1932. Man leaping over a puddle behind the Paris train station. Cartier-Bresson's decisive-moment manifesto.
From Wikipedia
Behind the Gare Saint-Lazare is a black and white photograph taken by French photographer Henri Cartier-Bresson in Paris in 1932. The photograph has been printed at variable dimensions; the print donated by Cartier-Bresson to the Museum of Modern Art is listed at 35.2 × 24.1 cm. It is one of his best known and more critically acclaimed photographs and became iconic of his style that attempted to capture the decisive moment in photography. The photograph was considered by Time magazine to be one of the 100 most influential of all time.