It is never a good idea to turn your back to your audience during a presentation, even when you are referring to the screen where your PowerPoint slides are being displayed. In those situations, do what accomplished stage actors and TV weathercasters do – cheat. In this context, “cheating” refers to orienting your posture so that your body is no more than a quarter turn facing the screen, and then turn your face slightly more in toward the screen. Also, never gesture across your body; always gesture with the hand closest to the screen. This preserves the illusion that you are facing the audience, but still allows you an adequate view of the screen as well. Even from this position, don’t forget to look back at your audience as often as possible to reestablish eye contact as frequently as you can.