@TeflonTrout @merlin To a former (non-tech) colleague who was always leaving her desktop unattended, I took a screenshot, mirrored it upside down, moved all the icons in a safe place, changed the desktop and mirrored her screen upside down (there's a keyboard shortcut for that). Her desktop was looking normal but the mouse going the wrong way and not being able to navigate menus made her panic, we quickly had to revert it 😅

@dalias I'm used to the problem of chromatism in astronomic lenses of telescopes, there's it's not uncommon to have 3 or even 5 layers of fluorite (or equivalent) to reduce chromatism of bright stars or planets.
BTW light pollution filters usually help there because some of them heavily filter blue to close-uv. Maybe this blue-light-filtering fad would help on your glasses?

@dalias You have chromatic aberrations in your glasses? That doesn't look right

@simontatham and commands for which the "recursive" flag is either -r or -R, picked randomly