Yes, I get how the A-series paper sizes work, and that they prioritise having all sizes be the same aspect ratio. That has literally nothing to do with what I'

Yes, I get how the A-series paper sizes work, and that they prioritise having all sizes be the same aspect ratio. That has literally nothing to do with what I'm talking about in my post. It turns out that paper "works" for things other than resizing other sheets of paper.