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The first photographs took a very long time to make. In the earliest cameras, a plate had to be exposed to light for many minutes before an image appeared. Because people could not hold still for so long, early street scenes often look empty: anything that moved simply vanished from the picture. Only objects that stayed perfectly still, such as buildings, appeared clearly. As the technology improved, exposure times grew shorter, and at last photographers could capture people in motion.

Early photographs needed such long —exposuredryingprinting times that moving people —vanishedsmiledwaited from the picture, so the streets often appear strangely —emptycrowdedcolorful.