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The ISO paper sizes are a practical example of how you halve the area while preserving the aspect ratio.

Is aspect ratio all that important?

I think articles like this one show a lack of imagination. When I think about folded stuff in my life, I immediately think of a newspaper or a road map. I'd love a display that I can fold an arbitrary number of times to get the size that makes sense for what I'm looking at and where I am.

I'm not saying "aspect ratios don't work, therefore the whole thing's a bust", just that we should expect that one or other of the devices will be quite a bit different from what we normally see.

There already are multi-screen devices. I could see a foldable screen being put on a Lenovo Yoga Book and not changing it all that much.

The Lenovo Yoga Book is quite different in the sense that the multi-screens are never really viewed as a single form. One screen is more of an input device, while the other is what we would usually see as a screen. I'm not saying that the foldable phone can't do this, just that it's very different from a "phone that folds out to have a bigger screen for watching media" device that I've seen people expect these foldable phones to be.

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