Darkness

'For example, darkness is to caving as water is to diving and air is to flying, a medium, in other words, that does more than any other aspect of the environment to shape your experience. Cave darkness feels like water on a dive or air on a flight, where air is your means of support, invisible but essential. It has weight and presence, life, a character of it's own. Water and air will kill you quickly if you violate your special relationship with them. Darkness can kill just as quickly - or, perhaps worse, and much more slowly.'

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