I was recently reminded of a fabulous online archive by a notice that it had been updated to include images from Mac OS 10.14 (aka “Mojave”).
Stephen Hackett, author of 512 Pixels, has compiled a brilliant collection of images from each version of Mac OS X, beginning with the first public beta version (“Kodiak”) through each major upgrade. Each version features a page of screenshots of various aspects of the interface, including the dock, applications, system preferences, and much more. It truly is a veritable time machine that enables you to explore the history of the Mac OS X interface as it has evolved since the first public beta version in September of 2000.
Set aside some time to explore and appreciate the depth of detail in the Aqua Screenshot Library. If you start at the beginning you can join the original beta testers in wondering why there was an Apple in the center of the menubar (that didn’t do anything).