Eizo makes a square 1920x1920 monitor: https://www.eizo.com/products/flexscan/ev2730q/ https://www.eizo.com/products/flexscan/ev2730q/ ... available on Amazon

Eizo makes a square 1920x1920 monitor: https://www.eizo.com/products/flexscan/ev2730q/ https://www.eizo.com/products/flexscan/ev2730q/ ... available on Amazon last time I checked ... they also make a square 2048x2048 monitor for ATC: https://www.eizoglobal.com/products/atc/sq2826/ https://www.eizoglobal.com/products/atc/sq2826/ ... although I think it costs $5k or so ...