I echo what others have said, but for me it is also set design. Yes, I want a compelling story that challenges me, and good performances, etc., but I am continually fascinated by sets and what designers create. This could have started with the first big Broadway style show I ever saw, MAN OF LA MANCHA, in a summer stock production. I was about 10, but I still remember the prison set, its massive stone walls and gigantic stone stairway. Sure, it was 2x4s and painted plywood but to my young mind it looked as real as granite. Too many memorable sets and set pieces come to mind to write about here. Scene transitions also fascinate me, how these huge set pieces glide in and out so quietly and effortlessly. Knowing the secrets of stagecraft doesn't diminish the thrill for me.
Without any doubt, if I could relive my life and have a whole new career I would be a set designer.