In this age when the means of human transport include devices which can span the
deeps of space in transtime, and other devices which can carry men swiftly over
virtually impassable planetary surfaces, it seems odd to think of attempting
long journeys afoot. Yet this remains a primary means of travel on Arrakis, a
fact attributed partly to preference and partly to the brutal treatment which
this planet reserves for anything mechanical. In the strictures of Arrakis,
human flesh remains the most durable and reliable resource for the Hajj. Perhaps
it is the implicit awareness of this fact which makes Arrakis the ultimate
mirror of the soul.