@praxeology Shaped like books!
@raphael It's also interesting that the word "book" comes from the old germanic word for beech trees. Apparently, before more modern paper and parchment became common, they used thin boards of beech wood as a medium.
@praxeology @raphael I always confuse the 'Buche' and the 'Birke', the latter was used as a writing medium as well: https://en.wikipedia.org/wiki/Birch_bark_manuscript
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