In
The Caves of Steel,
as in well-written science fiction of all kinds, language must constantly be inspected for surprises and reinterpretation. Baley notes, for instance, that there are no expressway directions to Spacetown. He explains why almost immediately: "if you've business there, you know the way" and "if you don't know the way, you've no business there." In a related logical process, the novel raises an aspect of Spacer attitudes that infuriates Earthmen. Earthmen are not allowed into Spacetown except singly and then only when thoroughly cleansed and decontaminated as if they were dirty and diseased. Later this business is turned around and inspected from the other side. Earthmen haven't changed, but Spacers have; like Wells's Martians, they have eliminated infectious diseases and contact with Earthmen might be fatal.