By Rob Mayoff. This is a MacOS X screen saver. It should work on MacOS X 10.4 (Tiger) and later. This doesn't work anymore. I think it broke in macOS 10.15 (Catalina) or maybe earlier. I'm not inclined to fix it as I don't run screen savers anymore, and haven't in years. Good modern monitors turn on very quickly so I just have the Mac turn off the display instead. This setting is in the Lock Scree