For a moment Lindsay thought he was seeing a mutant gasbag, some bizarre example of parallel evolution. Then he realized it was a flying machine: some kind of blimp or zeppelin. Long seamed ridges of sewn balloon skin supported a skeletal gondola. A thin skein of flexible solar-power disks dotted the craft’s skin, dappling over its back, fading to a white underbelly. Long mooring lines trailed from its nose, like drooping antennae.