This is Vantablack, a material made by the British company Surrey NanoSystems that sets a world record by absorbing all but 0.035% of visual light. It's made of carbon nanohair that is 1,000 times thinner than the average human hair.
The tubes are small enough to prevent light from entering them and packed so tightly that the light which makes it between the tubes bounces between them until it's absorbed.
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