I like it, but your idea only works if your back is to a wall. My wife did the boolean version of this, though, when I told her I wanted to spend $100 on a fan

I like it, but your idea only works if your back is to a wall. My wife did the boolean version of this, though, when I told her I wanted to spend $100 on a fancy board from National Instruments. She folded a piece of paper in two, wrote "DO NOT DISTURB" on one half, and propped it up next to me.