Fold the two pages outwards when you're not reading to show the front and back covers of your book?
Have the GUI on the left page, possibly with dictionary lookup box and contextual menus, and the text on the right page.
Fold in to protect your delicate screens
Show A4 PDFs split across both screens to make them readable.
You and your partner could eaven read different books at the same time on the same device.
Lots of fun to be had here!
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