Be unselfish. That is the first and final commandment for those who would be useful and happy in their usefulness. If you think of yourself only, you cannot develop because you are choking the source of development, which is spiritual expansion through thought for others.
Higher ceilings allow the use indirect lighting, which is much healthier and reduces glare.
I want to direct but I think I'd be bloody awful and I don't want to produce but I think I'd be a very good producer because if I believed in something I'd be able to protect it.