‘At the weekends,’ Christopher says, ‘when I’m out for a walk with my wife, along the cliff tops near here, on a sunny day, I know our bodies are wide-meshed nets, and that the cliffs we’re walking on are nets too, and sometimes it seems, yes, as miraculous as if in our everyday world we suddenly found ourselves walking on water, or air. And I wonder what it must be like, sometimes, not to know that.’ He pauses, and it is clear that he is thinking now beyond the confines of the salt cavern, beyond even the known limits of the universe. ‘But mostly, and in several ways, I’m amazed I’m able to
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