The default are the still ones, but it does kind of blur the lines a bit. I got this answer from Grok so it may not be 100% right, but we can assume something like this must be going on if you haven’t been seeing the default still wallpapers for the past few years. Each macOS version’s default wallpaper and Dock icon layout are displayed on its Wikipedia page.Gotcha. Ok, so who knows, maybe with the very first MacOS I had I did change it. That starts to blur the definition of the 'default' for each OS.