How long is this state of twilight, this in-between time when day begins to be covered over, when light remains, and is finally lost? Sometimes it is hard to say. It slips past as I am trying to catch the moment. I have walked across the river in the dwindling shadows of afternoon, slipping by unnoticed like the fading light, until suddenly I look around and it is darker still, changing the look of the streets like a spell cast, concealing the way I have come.