How is writing 2d, just because you can't fit a given text on a piece of paper and need to text wrap? That doesn't make it 2d.
> reliably communicate some of the nested arboreal complexities
Text/Subtext, text/'direct' and implied meaning, maybe?
I don't think 2D refers to conventional dimensions but to a dimensional structure implicit to text as an object made of objects, nested and nesting all the way up and down.
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I think they mean that, with writing, it’s easier to parse complex syntax trees. Think fractal dimension and finite vs stack memory.