This is a small 320 x 240 movie, with sound, of the picturesque Chiswick Park waterfall. The clouds also move gently.
The movie runs for 20 seconds. If you set your player to loop it'll run forever, with a slight hiccup at the joint as the clouds move back. It's in Windows wmv format, with a file size 536k.
To view or download the movie, click or right-click, as appropriate, on the thumbnail above.

If you use Windows XP you can run this movie as a screensaver - looping forever - with XP Video Powertoy. You can play about with it, running it at different speeds and sizes. If you run it full screen it'll be a tad fuzzy, of course.