Wallpaper Rotation on Mac
I was visiting an Apple Store today and I notice the wallpaper on the Powermac G5 is rotating (dissolving) every five seconds.
I knew about this feature a long time ago but I never bother to turn it on, since my desktop is empty and I never use them. But I realize, this is a very beautiful feature for demo.
To rotate your desktop wallpaper, go to Desktop & Screen Saver Preference pane and tick the Change picture option and select the time frame. You could also tick the random order option to randomize the wallpaper.