Without feeling abashed by my ignorance, I confess that I am absolutely unable to say. In the absence of an appearance of learning, my answer has at least one merit, that of perfect sincerity.
Most of my career up until the last couple of years has basically been a training ground for me. Actors that came up in the '50s and '60s, they had the theater, and television was in its infancy.
Poets and heroes are of the same race, the latter do what the former conceive.

