There are these trees, a line of them, just around the corner from my home. They stand on a little hump in the middle of a school field - silver birches and trees of a kind I don't know with a very dark bark. They're nice trees - welcome shade in the summer, graceful and pretty...but I don't notice them much anymore. Except, occasionally, on a blue sky day when the branches are bare of leaves (as they still are and probably will be until the beginning of May)and the sunlight catches the papery white back of the birch trees making them shine. Then, the contrast of dark and light branches against a bright blue sky makes me catch my breath.