Domain not in remote thumbnail source whitelist: staging.cohostcdn.org
from https://cohost.org/lunasorcery
(Seems to behave weirdly on multi-monitor mixed-refresh-rate setups. Also, if you use Reduced Motion, make sure to turn it off for the animation to work)
To read it, look for the lowest number which isn’t turning and which appears in dark text (ie isn’t flickering on alternate frames).
Original version, supports 30/48/50/60/90/120/144hz:
Warning: flickering imagery, open at your discretion. A zoetrope-like disc covered with numbers carefully arranged in patterns. As it spins, the viewer's refresh rate remains visually stable amidst a flurry of other dancing numbers. [https://moonbase.lgbt/misc/cohost/2465593/wheel2.png]
Even more ridiculous harder-to-read version, supports all of the above plus 75hz:
Warning: flickering imagery, open at your discretion. A zoetrope-like disc covered with numbers carefully arranged in patterns. As it spins, the viewer's refresh rate remains visually stable amidst a flurry of other dancing numbers. [https://moonbase.lgbt/misc/cohost/2465593/wheel3.png]