For the French photojournalist Henri Cartier-Bresson, the most important moment in the making of a picture was that defining click—the moment when his camera captured the moving scene and made everything stand still. Cartier-Bresson’s lens led him all over the world. He photographed the Spanish elections, the coronation of George VI, and George Balanchine and the New York City Ballet. He took the last photos of Ghandi, just a few hours before the Mahatma was assassinated. And in 1948-49, Cartier-Bresson was in China to document the fall of the Kuomintang and the launch of the communist regime. In 1958, he was there once more to catch Mao Zedong’s ascent to power. This rare exhibition features images from those two trips to China. —Elena Clavarino