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TIL - Linux supports tilted monitors... apparently 22° is best
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
Technically that's compositor level stuff, and it probably can even treat it like an actual diagonal display and prevent windows from going there and everything.
This is a good example of why some of the protocols are taking so long. Once finalized, it'll probably somehow also be capable of handling... that.
With an accelerometer and a compositor written for that can probably even keep it level in real time. Tilt monitor and windows rotate to match automatically.