In Warhol's art, there is a great deal "there," especially in his films.
> The essential method was to subcontract all that messy hand work out.
Warhol got somebody else to do the work.
So did Sol LeWitt. In both cases, the artists had others execute their designs. Which has happened a lot in the history of art. Htichcock did not film the scenes himself, or edit them, or compose the scores -- but he made sure that the work was done according to his design/plan in the areas of cinematography, editing, and scoring.
Brian