As a visual spectacle, it rivals anything in The Lord of the Rings or King Kong, precisely because you know you're seeing a human being in action.

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"There's an automated complaint form, which gets an automated reply, which lets you know you're in a queue, and eventually a human being will get around to scrutinising it and do something about it, " he said.

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You can see 50 miles from one end of the valley to the other, and you're more likely to spot a wolf or an elk than another human being.

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