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I was as well - everytime I see one of these they also pause too briefly at the change over from inhale/exhale and back.

It's disconcerting because its not how I naturally breathe.

maybe this one works better?

https://lassebomh.github.io/box-breathing/

Indeed. I kept wondering if the circle was actually getting lighter as it got smaller or if that was just how I was perceiving it due to the afterimage and whatnot.

It does change color ... right?

This is a very HN exchange

task: stare at circle

HN, staring at the circle: they could use CSS for this instead of JS

Yes! In my periphery it looked like a polygon but when I focused on the edges it seemed like a properly antialiased circle.

Interesting, I saw the same!

Yeah I saw the same. A rounded-corner polygon.