That's nice, but they were interactive - You could move around the scene or change the camera angles. The fact that you could do this and prove it was realtime and not prerendered was part of the demo and most of the charm. Lacking that, it's just... lacking.
Most of that charm is gone after 20 years, nobody needs proving the dynamic lights are really dynamic anymore.
They're still some fun to interact with anyways, or just fun as a way to review what was hot shit at the time, but I couldn't get a few of the really old ones to run on Windows 10/11 this summer. A video is a lot better than just saying "well, I'm not going to build an old PC just to play this demo" and not seeing it at all.
You'll have to use the Internet archive to see them all. [1] Several, like 'Dawn' for example, were quietly removed in 2020.
[0] https://www.nvidia.com/en-us/geforce/community/demos/
[1] http://web.archive.org/web/2019/https://www.nvidia.com/en-us...