Excellent question - I believe it should start with 'writing' a book in a way that's already spatial. Then 'reading' it could be more natural for this medium. But that's only the case for books that are not written yet - as for the others - try, test, and let us know what works!
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Dusting off our spatial bookshelf to make room for your amazing content.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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can you imagine just grabbing one of these books and reading it? How would the spatial book look like? 

