system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:If white reflects all light and black absorbs all light, why does a white sheet over my window let in more light than a black sheet?
gpt
The white sheet does reflect more light - into the room. It's not a completely solid barrier (like putting a mirror up over the window, which would reflect *all* light). The light hits the fibers and bounces around and through the sheet, because it's not completely opaque. This happens with the black material, too, but to a much lesser extent, and so there is less light entering the room. 

Absorption is what makes the black sheet block more light from the room.