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How the hell do you illustrate a phenomenon so utterly bewildering. With a diver on the edge of a cliff? Some lights flashing in a dark wood? A neon sign reading ‘black hole’? This documentary tries all of these approaches and a few more, but nothing quite works. In fact, the visual gimmickry is mildly distracting, particularly in the context of a subject that requires 100 percent concentration. This might have been better as a radio doc, but it’s still fascinating, headspinning stuff.