In my childhood memories, when my grandpop visits, it is always a golden-glowing, long spring day with an azure sky dotted with drifting marshmallow clouds. When I am perhaps four or five, he takes me and my younger sister on a walk through a wooded area in Philadelphia. We stop to eat a snack. My grandpop shows us how to rinse our hands in a spring that flows between some rocks and rub them together until they dry. It does not take long on this pleasant day, but I think it is an amazing trick to dry our hands this way. Suddenly, three horses with riders materialize on the trail and gallop past us. The horses are huge—or so they seem to me–and it happens so quickly that it is almost like a dream, a magical moment in the woods. The magic of the woods stays. All these years later…