I've had a few weekends of office work, with a computer looking at a wall. The Fire Prevention Officer shut the lights out on me one Sunday. I said loudly, "Nope!", and he popped his head in and said, "Sorry didn't realize you were in here. We're going to have to cut a window infront of your desk so people know you're in here".
Haven't done that yet. But I did get to listen to a good
ETown, from Burlington, VT episode. The last song is Anais Mitchell and "Why We Build the Wall". I love this song!