If i was the director

If i was to direct the dagger scene in Macbeth, i would definitely make him look mad. i would do this by having Macbeth actually grab a dagger out of the air when he says "come, let me clutch thee". Then have him look at it and it would disappear, this would  make him appear as though he never had the dagger in the first place. this will definitely make him look mad, by giving him the illusion that he was holding the dagger that he was obviously hallucinating.