After some practice I can see Haidinger's brush (=> https://en.wikipedia.org/wiki/Haidinger%27s_brush ) with little to no effort. Turns out that this is inadvisable! Why? Because now I can see the effect each time I have to change between screens in landscape and portrait orientation when they are next to each other. It was so distracting that I had to change back to a landscape-only setup.
Huh, I can see it reliably but the effect is soooo subtle I can't imagine this being a nuisance. The dust that I often don't bother to wipe of my monitors is more of a problem (at least a few times in the past it masqueraded as punctuation).
