@clacke In "Children of Dune" its described thus: "He moved with the random walk which made only those sounds natural to the desert. Nothing in his passage would tell that worm back there that human flesh moved here. It was a way of walking so deeply conditioned in him that he didn’t need to think about it. The feet moved of themselves, no measurable rhythm to their pacing. Any sound his feet made could be ascribed to the wind, to gravity. No human passed here."