This video is discussed by one of my textbooks on design as a great example of how "sketches" of concepts can help you decide what to build, even if you don't have the technology to actually build the thing yet. It's a lot better than investing $100 million in a technology and then finding that it isn't any fun to use.
Plus, wouldn't it be cool if toy cars DID work like this?
"When people are married, instead of trying to get rid of each other, reflect that you have made your choice, and strive to honour and keep it." --Brigham Young
If you're so evil, eat this kitten!