Overhead, capricious spring clouds began to scud across the sky in mackerel shapes, promising more rain. Garraty turned up his collar and listened to the sound of his feet pounding the pavement. There was a trick to that, a subtle mental adjustment, like having better night vision the longer you were in the dark. This morning the sound of his feet had been lost to him. They had been lost in the tramp of ninety-nine other pairs, not to mention the rumble of the halftrack. But now he heard them easily. His own particular stride, and the way his left foot scraped the pavement every now and then. It seemed to him that the sound of his footfalls had become as loud to his ears as the sound of his own heartbeat. Vital, life and death sound.