They regarded the bridge. It had a certain negative quality. That is to say, while it was possible at the limits of probability that if they tried to cross the chasm by walking out over thin air this might just work—because of sudden updrafts, or air molecules suddenly all having a crazy idea at the same time—trying to do the same thing via the bridge would clearly be laughable. There was no mortar in it. The pillars had been piled up out of rocks laid like a drystone wall, and then a series of big flat stones dropped across the top. The result would have been called primitive even by people
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