On Tue, Jun 16, 2020 at 7:46 am, Michael Catanzaro
<mcatanzaro(a)gnome.org> wrote:
Select the animated background in gnome-control-center and see for
yourself how it works. :) It's an XML file that describes state
transitions between static images. Usually only the colors vary,
transitioning to darker colors at night, lighter colors in the
morning, standard colors during daytime.
I should add that GNOME upstream has been using animated backgrounds by
default since... again, I don't remember, a long time. It's not a
gimmick, it actually looks good and works well.