There's no competition. When it comes to the American Idyll, the hammock and the Adirondack chair are the shoe-in (and shoes-off ) winners. Built for lazing around in, they're the classic icons of a summer getaway. And they're both quintessentially American. The hammock, invented by the native inhabitants of the Caribbean, was "discovered" by Columbus on his first voyage to the New World. And the Adirondack chair--whose name evokes the mountain retreats...