I am looking at building an addition for a study and one issue is the need for windows. Frankly, I don't need to look out a window at a tree when I am working in my study and much of my work is at night, so the whole "natural light" thing is irrelevant.

Windows add a lot of expense and heat loss to the building, so why do people even build windows? So they can look at the ugly bushes or the blind alley or the siding of the house next to them? Let's face facts: most windows do not look out on beautiful ocean vistas, or the Grand Tetons, so why even bother with them?