The Shield Wall is everything I expected: a high, solid expanse of rock, mercifully free of worms and gratifyingly dense with Aluminum. The O'odham is not at all what I expected. Such greenery, in the open, on Arrakis! The past efforts of Testing Station No. 163 play their role here, for certain, but what part is played by the vicious Maas Kharet and their warped religion?