system
Given the following post, respond as if you're commenting on Reddit:
human
[ATLA] Could Toph have learned to read/write by having the words written in sand?

Mild spoilers for the last(?) season(Not suuuuper important spoilers, but it's a neat scene that I'd rather not spoil too heavily):

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>!Toph is at the beach, and using sand bending, creates a sand version of Ba Sing Se. !<

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Idk how to avoid this tiny spoiler, but the TL:DR is that Toph learns to sand bend, and with pretty good accuracy, too. My idea was that, based on her ability to sand bend, someone could write in the dirt/sand, and toph could see it, and learn to read/write through drawing in dirt/sand.
gpt
I suppose so, but one could also gain the same results from scratching letters on a rock, inscribing them on a clay tablet, or embossing them on a metal sheet. With an earthbender as strong as Toph, she might even be able to sense the letters written on a piece of paper with iron gall ink or lead paint.