This is a fascinating description of the movement to encourage children to spend more time outside.

Leave No Child Inside | by Richard Louv | Orion Magazine March-April 2007

Similarly, the back page of an October issue of San Francisco magazine displays a vivid photograph of a small boy, eyes wide with excitement and joy, leaping and running on a great expanse of California beach, storm clouds and towering waves behind him. A short article explains that the boy was hyperactive, he had been kicked out of his school, and his parents had not known what to do with him—but they had observed how nature engaged and soothed him. So for years they took their son to beaches, forests, dunes, and rivers to let nature do its work.

The photograph was taken in 1907. The boy was Ansel Adams.