What these narratives all suggest is something seemingly paradoxical: that darkness might be a medium of vision, and that descent may be a movement towards revelation rather than deprivation. Our common verb ‘to understand’ itself bears an old sense of passing beneath something in order fully to comprehend it. ‘To discover’ is ‘to reveal by excavation’, ‘to descend and bring to the light’, ‘to fetch up from depth’. These are ancient associations. The earliest-known works of cave art in Europe – taking the form of painted ladders, dots and hand stencils on the walls of Spanish caves – have been
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