This video discusses the "Cody" bridge, which is a pedestrian bridge over a canal that has been designed to move up and out of the way when ships need to travel through. The mathematics of the bridge movement are discussed and diagrammed. It is unique and educational.
What great illustrations! Simple animations like this are so powerful. I describe them as simple because they are just lines and filled shapes but I'm sure they weren't simple to create or conceptualize. Great inspiration.