At one of my jobs, I worked in a small office with four desks. Two of the walls were glass, looking towards two interior walkways - one was a hallway with a mirrored office across the way, the other was a main thoroughfare with the break area across the way.<p>It was a fairly open office, so there was /some/ natural light. Not much, but some. The office used pretty bright/natural-looking lighting anyway - it wasn't flickery, dim, or harsh. We hardly got distracted, because we covered almost every inch of the glass with whiteboard marker diagrams, notes, et cetera. One of my officemates used the window behind him as his todo list.<p>It was by far the best office situation I've been in in the past five years.