You can consider a good demo, like a exhibition performed by a martial arts master. There is no unnecessary movements, concise, everything should just work together in beauty. But most of that is only apparent to someone that has at least some comprehension of the sport. Otherwise it's just an old guy flipping out.
The demoscene is also historically a source of cutting-edge innovation in terms of graphics and pushing hardware to the limits. So stuff like this in important because it drives other sceners to try even hard, pushing the go-kart just a little bit more over the hill.
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