At Swiss Waldkindergartens, or forest kindergartens, children between the ages of 4 and 7 spend the entirety of their school days playing outside. Come rain or shine, the kids run around in the woods, play games together, build structures with found objects, and explore their natural surroundings. The goals and expectations for the children are fairly minimal--learning how to write their names on the ground for instance--and math and reading are not taught until first grade. Et seq.