Walking along past the store windows, into which she peers with her usual eagerness, her usual sense that maybe, today, she will discover behind them something that will truly be worth seeing, she feels as if her feet are not on cement at all but on ice. The blade of the skate floats, she knows, on a thin film of water, which it melts by pressure and which freezes behind it. This is the freedom of the present tense, this sliding edge.