That's an interesting idea. The closest thing I can think of is using an extended box-drawing font: https://hpjansson.org/blag/2024/01/18/chafa-1-14-all-singing

That's an interesting idea. The closest thing I can think of is using an extended box-drawing font: https://hpjansson.org/blag/2024/01/18/chafa-1-14-all-singing-all-dancing/#:~:text=all%20the%20shapes%20you%20could%20ever%20want https://hpjansson.org/blag/2024/01/18/chafa-1-14-all-singing.... That doesn't solve the two-colors-per-cell challenge. But it makes for some very realistic terminal images. For higher fidelity rendering, I think the next best option is supporting image protocols like sixels or Kitty inline raster images. I'm not sure how overprinting would compare to existing options.