Seen successive evenings at dusk: two great blue herons, streaking home toward the Claggett Creek wetland, as distinct and as similar as two different thoughts. And where were they, I wonder, before their last flight of day — the outcome of whose life, arisen in whose brain? Both evenings were clear. But now clouds have moved in and the atmosphere has changed. Will this lead to a change of thoughts? And what if I happen to be looking away? What if I’m absorbed by smaller thoughts, such as sparrows or jays? What if there’s rain?