there’s a wall behind you (so no one can sneak up behind you). there’s a wall to one side (too much openness makes you feel exposed). there’s no blank wall within 8 feet in front of you (or you have no place to rest your eyes). you work in at least 60 square feet (or you feel cramped).
It’s a neat list, and Gretchen writes up a great summary. Is Your Workspace Driving You Crazy? – [The Happiness Project]