You can theoretically have "artistic" polygons where it renders using a mixture of characters to emulate how that grid would be filled if a certain shaped was laid over it but the end result wouldn't be very functional for the purposes of diagramming.

Not everything has to be done in arcane ASCII diagrams because of vibes and LLMs.

This is yet another fad destined to be forgotten.

At the same time, I don't think one should necessarily limit your expression based on constraints like accessibility.

In big ASCII letters on the landing page: Unleash your ideas with ASCII [] MonoSketch is a powerful ASCII sketching and diagramming app that lets you effortlessly transform your ideas into visually stunning designs.

:-)

You need to find the monospace whitespace characters (seems there's a few [0]). Then encode a compressed version of the logical diagram in the white space, steganography style.

Or do something with characters [1] to compress a lot of data into a tiny ball of hair at the end.

Draw.io smuggles the XML in a PNG which I've always admired.

[0] https://en.wikipedia.org/wiki/Whitespace_character

[1] https://en.wikipedia.org/wiki/Combining_character