I Need a Rear-View Mirror

While most people only need them for backing out of a parking spot, I could definitely use a rear-view mirror for my computer. That's because of the way my cube was built. Unless someone has particularly loud shoes, I never know when someone's walking into my cube space to chat. So, I find myself jumping out of my seat every time someone comes up sneakily behind me, surprised to find someone there watching my every move. Not that I would ever be doing personal e-mails of course J. My sister-in-law actually recommended getting a tiny mirror to attach to my computer to prevent this from happening. Supposedly they really do make these…perhaps it's time?