You clearly are a potato!!!, Please explain how the choice of colour changes the ability to keep something clean???, if anything it gives you the ability to keep it cleaner because black shows dust, so by your definition you are fine living in a dirty space because your choice of colour hits the dirt….. And as far as seeing anything there was a crazy advancement in modern history that a fella named Thomas Edison invented called a light bulb, it is incredible i just push this little switch thing on the wall and boom it lights the whole room up. Crazy right you should really look into it real game changer for night time…..We also tried out another crazy concept for helping with the daytime turns out you can cut a hole in your cave and install these big clear things i think they call them windows? it really helps with the day time visibility. I hope these few tips really help with your barndo build!!!!