I think you may be right. I think Tina Packer used lighting and set quite a bit to structure the play and give things a reasonable narrative flow, as well as to add appropriate dramatic and emotional flourishes. I mean, the whole scene where Arthur is begging Hubert not to blind him -- I can see that that, for instance, could be pretty over-the-top and basically stupid. But the way it was done in this production was damn effective, and I think that lighting and set was almost as important as the amazing acting in making that be so.