Conversation so far:
What was the revelation that shaped Lee Strasberg's life?
when Stanislavski brought his Moscow Art Theatre to the United States in 1923. He had never seen an ensemble like this with actors completely surrendering their egos to the work.
Where did Lee Strasberg observe the actors?

Question: What was unique about these actors?
Self-contained rewrite: What was unique about the Stanislavski actors that Strasberg observed?