In TV and movies, you kill yourself spending all this time to think up the symbolism or what if that deer that runs across your hero's path somehow conveys what's going on inside your hero's head? When a lot of times, you just want to hear what he's thinking.
Windmills, which are used in the great plains of Holland and North Germany to supply the want of falling water, afford another instance of the action of velocity. The sails are driven by air in motion - by wind.