Squirtorus: From the XScreenSaver Collection, 2022. 

A scrolling landscape vents toroidal rainbows into the sky. Above, the stars are slowly going out.
Written by Jamie Zawinski; 2022.
XScreenSaver is a collection of hundreds of free screen savers for X11, MacOS, iOS and Android. Download them all here:
www.jwz.org/xs...
This playlist contains videos of them all:
• XScreenSaver