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You are so right, the problem is that the audience does not know what place is being marked and becomes confused.I would be very interested to hear what the result is when someone does the totally unexpected, like using some other medium besides Power Point, and with the lights on. I may sound skeptical but in a former life I was subjected to two or three really bad Power Point presentations twice a month for two years. I promised myself that I would never subject anyone else to that wretchedness.