I've been going through my neighbor's set of TOS DVD's. One of things that has always impressed me is the rather creative way in which the prop masters took existing props used in one episode, took them apart and reassembled them for other episodes. Often times, I'd completely missed it. Right now I'm watching "Gamesters of Triskelion", and the scene where Kirk contends with the Providers in their underground chamber has just completed. In it, you see the bubble that is topped with a red star, covering the Providers. That is re-used from the top of Lazarus' ship in "The Alternative Factor." In the background of that same scene is the matte painting that was used for the pergeum mining facility on Janus VI. Most viewers probably take these things for granted; I know I once did. However, I suspect when we think about it some part of us is impressed at least a bit with the prop work in this series. I could think of several others, but then where'd be the fun in that? Your turn.