Samuel Beckett wanted his plays done exactly as he wrote them and as he particularized them in his stage directions. Don't think of adding even a second tree, for instance, to the Waiting for Godot set.
We know that cats have nine lives. "Cats," based on T.S. Eliot's "Old Possum's Book of Practical Cats," with music by Andrew Lloyd Webber, with additional lyrics by Trevor Nunn, shows us how this process of reincarnation works.