Which, thanks to researchers working on a substance called "Vantablack," I might someday be able to pull out of my pocket and apply anywhere, giving the appearance of a hole.
A picture at the link shows what aluminum foil looks like when it's coated in Vantablack -- even though it's wrinkled and crinkled all the way across, the developed compound absorbs 99.96% of the light that hits it and to the human eye looks featurelessly black -- just like a hole. New Yorkers immediately expressed an interest in buying clothing coated with the stuff.
Continued research is likely to produce a coating which can be applied like others and create nighttime camoflauge, and may also give hints towards a coating that effectively bends light around an object.
(H/T Dustbury)
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