How would I Direct the Macbeth Dagger Silioquy

If I was a Director, and I had the job of Directing the Macbeth Dagger soliloquy scene I would not put a real dagger in the scene. The reason for this is because I believe that Macbeth is mad! and that should be more defined. It does towards the end of scene 2. One quote that would want me to direct Macbeth in a more crazy way is when he says "I have thee not, and yet I see thee still" (2.1,35) I would make Macbeth talking to himself and there would be no dagger in sight.