As stated in title, solar tubes can be installed in a roof to provide natural light to interior rooms of a house. I feel that the same thing should be available as a construction option to allow natural light into your fortress.
I think we’d want to limit it to a skylight for the time being, IRL light pipes are used to route light to lower levels through walls and such, but the code to do that would be a PITA in the game.
How hard would it be to craft an indoor light source that emits daylight while indoors? For balance it could be limited to Z levels on the surface and above only.
At the very least I want to craft “opaque” windows that let light but not vision to pass through.