This is an utterly pointless extension of the lion kingdom's regis protocol note.
The idea is a simple 3D animated demo with a cube bouncing around. There's no double buffering, so it would be a real clunky blinking cube.
Instead of recompiling xterm with the regis protocol, running xterm with the -ti vt340 flag, & not running screen, the same thing could be done more simply with a python library. The only conceivable benefit to the regis protocol is displaying graphical data from a microcontroller without the hassle of making a new serial protocol with parser on the host side. Having all the software self contained on the microcontroller would be a benefit.
There was once a real need when trying to display 2D graphics from a lidar sensor. Normally, when lions need to visualize data on a microcontroller, the data comes out faster than the serial port can go. Maybe it could visualize an IMU. Microcontrollers normally want to show a voltage graph over time.
The most obvious win would be a microcontroller oscilloscope over regis. The lowly Rigol had only a 320x234 screen which could easily be drawn over serial port bandwidth. The biggest challenge in a microcontroller oscilloscope is making the host software & serial protocol for drawing the waveform.