NEC introduced 4:3 Color Accurate Desktop Monitor

[Puppy]

NEC introduced a new 4:3 desktop monitor again in 2015: https://www.necdisplay.com/p/displays/p212-bk-sv

DPI is unfortunately too low (21" 1600x1200 = 95 PPI only), but still a good start

[Thinkpad4by3]

4:3 High PPI medical monitors have been around for a while. You can get them in 3MP(2048x1536) and 5MP(2650x2048). They will just cost you an arm and a leg.

[RealBlackStuff]

The original use for the BoeHydis 4:3 15" HV150UX2-100 (1600x1200) with LED-backlight was also in medical equipment, such as Ultrasound scanners.
They were found to be so reliable, that they also use them in aircraft cockpits.

[pianowizard]

If you want a tall desktop monitor, why not just rotate a 16:10 or 16:9 monitor into portrait mode? I used to do that to several QHD monitors, making them 1440x2560, e.g. see https://www.thinkpads.com/forum/viewtop ... 49#p772649 . At some point I may rotate my 30" Monoprice monitor into 1600x2560.

Whereas a laptop's screen height can't be changed, for desktop monitors, tablets, and smartphones, one can rotate the screen. Just make sure it's IPS or VA, because a rotated TN screen looks terrible.

Also, don't forget the EIZO FlexScan EV2730QFX 26.5" 1920x1920 IPS monitor.