They seemed amazingly busy.  I began to ask myself what they could
be.  Were they intelligent mechanisms?  Such a thing I felt was
impossible.  Or did a Martian sit within each, ruling, directing,
using, much as a man's brain sits and rules in his body?  I began to
compare the things to human machines, to ask myself for the first time
in my life how an ironclad or a steam engine would seem to an
intelligent lower animal.