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4 bridges that go nowhere
Bridges connects things. It’s the most important thing about them. Literal bridges connect one piece of land to another. Metaphorical bridges connect one person (or thought, or idea, or thing) to another. If a bridge doesn’t link something (or someone) to something (or someone) else, can it really be called a bridge? If it can’t, what’s it called? And if it can, what effect would this have on the word’s use as a metaphor? Would we have to start using “tunnel” instead?