Few of my students ever have, or ever will, walk a manufacturing line. Without that experience, it's hard to understand how much innovation goes into building even simple products that lies beyond the surface "design."
The bulk of innovation needed to make a beautiful product goes into figuring out how to make it over and over again without sacrificing quality. It's behind-the-scenes, decidedly unglamorous, usually made out of metal, and will last for decades.
This was the innovation of our country's past, and may be our future again, if we're lucky (Andy Grove talks about this in How America Can Create Jobs). All of this is a preamble to a wonderful short video for Randolph Engineering, maker of high-end sunglasses, that offers a brief glimpse into the art of manufacturing.