We researched dark coating for astronomical telescope. 0.00035 albedo is pretty impressive. It does not reflect any light, nothing human eye could focus on, so

We researched dark coating for astronomical telescope. 0.00035 albedo is pretty impressive. It does not reflect any light, nothing human eye could focus on, so it is impossible to judge distance and details. It is practically invisible and alien. So wall out of this material would appear as 'dark hole' and we would practically walk into it. We did also experiment by covering room walls with dark cloth, so it would not reflect any light. It was strangely claustrophobic, you could only see light bulb filament and nothing else. Something like this picture: https://en.wikibooks.org/wiki/Wikijunior:How_Things_Work/Light_Bulb#mediaviewer/File:LightbulbGlow.jpg https://en.wikibooks.org/wiki/Wikijunior:How_Things_Work/Lig... It would be fashion revolution, If they turn it into practical material safe for humans and weather resistent.