Picture 1: 2007 Transformers Movie Optimus Prime. Picture 2: 2018 Bumblebee Movie Optimus Primepic.twitter.com/yQpPsTYHSS
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Not sure if it's that unique from other transforming mechs (see Robotech/Macross, which arguably did it better in animation), Though I agree with the rest. Also, it provides a nice organizing principle for the design, something that feels absent to me in the movie designs.
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