You know, I've been watching Ken Burn's documentary on The West recently. In one section, they describe the fact when horses were introduced to Native Americans, it dramatically changed the way they lived at the time, enabling them to cross vast distance.
One interesting detail I've noticed in this latest episode of Westworld is when Ake is talking about the "something that had changed them forever". The next scene we see is a shot of a white horse surging ahead. It was powerful imagery combined with those words, and I can't help but think it was very deliberate juxtaposition, because the next scene after that revealed he was talking about the door. When I realized what they had done, I thought it was a really neat piece of work. Hopefully I'm not the only one who's noticed this.