How interesting it would be, I wonder—after catching Bradley Cooper’s Maestro (on Netflix), twice—to observe Cooper, 48, on the film’s set, where he convincingly channels musician Leonard Bernstein, ageing between 25 to 69. 

And then for Cooper, in prosthetic make-up, to slip out of this trance-like state, off and on, giving practical instructions to cast and crew, as director—going back inside Bernstein, as the camera rolls again!