Have you ever analyzed the transformations of the bots from one mode to the other? This is something that I've done a few times. However, they occur so fast at times that it's hard to see exactly how the parts shift around and produce their alternate forms. The only bot whose transformation I can visualize clearly is Bumblebee's; in the second film, he, Sam, Mikaela, and Leo are in a garden at nightime and Bumblebee transforms from his robot-mode to his vehicle mode. It's shown very clearly how the transformation occurs. I've tried doing this with Optimus, but his is just way too complicated. For example, the frames of the front tires in his truck-mode are his ankles in robot-mode, and the frame of his rear wheels are his legs. However, I've never been able to get a good glimpse as to how these particular parts shift around to their positions when in robot-mode. Anyhow, do any of you guys do this? Did you notice that in Dark of the Moon, Optimus' abdomen looks different from the way it looks in the first film and Revenge of the Fallen. Here are two pictures to show you the difference: Design used in first two films Design used in Dark of the Moon What's the explanation for this difference? I initially thought that perhaps a change to his anatomy was made after he combined parts of Jetfire to his body in ROTF, but at the end of ROTF you see that he looks as he did before the combination.