There was a great director who directed a picture that I wrote who barred me from the set quite appropriately and said, "I'm sorry, Jim. When you're directing, you don't need to know everything. You need the illusion that you do. " And, you know, and I WOULD be there behind him trying to signal the actors in, you know, in a way I wasn't even aware of.
Phantoms in general are nothing more than trifling disorders of the spirit; images we cannot contain within the bounds of sleep.