Every time I read about a window in a shop, I remember the best shop I ever had.
It was a building of my own construction and was a simple, one-room building with a sloped shed roof. The back wall, which faced north, was six and a half feet high but the south facing front wall rose to almost 12 feet. It was almost all glass. the view was spectacular being that the shop was on a hilltop from which you could see five mountain ranges.
The result of all that glass was that it was like working outside. The natural light that filled the workspace allowed me to clearly see any sanding imperfections and I never had to worry about how a color match really looked. And, as an added bonus, I never hand to worry about lighting when I needed to take a picture of something.
Later I moved into a commercial space in a concrete tilt up style building with no windows and fluorescent lighting. It did have a big roll up door so some daylight was able to penetrate. But it was still cave like compared to my previous sunlit workspace.
I keep telling myself that one of these days I'll build another shop like that.