in imperceptible stages he went from sitting apart and witnessing and counting the migration to first feeling his legs ( two of them , and both whole and strong ) beginning to move in slow effortless stride , then his waist and arms starting to move , then his senses gathering in the sights and sounds and smells ( stale huffing breaths , sweat-soured clothes ) of proximate human bodies , then the feeling of movement in his inner-ear and balance equilibrium .