Its been done. The first CRTs were circular. Take a look at this one on a PDP-1 from 1959: https://en.wikipedia.org/wiki/PDP-1#/media/File:PDP-1.jpg https://en.

Its been done. The first CRTs were circular. Take a look at this one on a PDP-1 from 1959: https://en.wikipedia.org/wiki/PDP-1#/media/File:PDP-1.jpg https://en.wikipedia.org/wiki/PDP-1#/media/File:PDP-1.jpg (yes, that thing next to the typewriter)