One of my favorite places to look in the forest is up. I love the way trees frame patches of sky, and how rays of sun slide over the branches and slant into pockets of darkness. On a recent stroll through the woods near Echo lake, I found myself, as usual, looking up. I saw mostly fir and birch trees, and I took their narrow trunks and modest heights as signs of a young forest. But it was a much older tree that caught my eye.