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The earliest known books are the clay tablets of Mesopotamia and the papyrus rolls of Egypt. https://www.britannica.com/topic/publishing/Book-publishing -
Vellum and parchment are materials prepared from the skins of animals. Egyptian sources refer to documents written on leather as early as 2450 bc, and a fragmentary Egyptian leather roll of the 24th century bc survives; but leather was rarely used because there was enough papyrus. https://www.britannica.com/topic/publishing/Books-in-the-early-Christian-era -
Christian era, literary and archaeological evidence indicates that the Chinese had writing and probably books at least as early as 1300 bce. Those primitive books were made of wood or bamboo strips bound together with cords.https://www.britannica.com/topic/publishing/Book-publishing -
It has been suggested that papyrus was continuously in use in Greece from the 6th century bce, and evidence has been cited to indicate its use as early as 900 bce. https://www.britannica.com/topic/publishing/Book-publishing -
During the golden age of Athens in the 5th century BCE, books were known and used but were lightly regarded as avenues of learning. https://www.britannica.com/topic/publishing/Books-in-classical-antiquity -
Rome was the channel through which the Greek book was introduced to the people of western Europe. When the Romans conquered Greece they carried home Greek libraries to serve as a foundation for similar libraries in Rome. Roman libraries had separate collections of Greek and Latin books. https://www.britannica.com/topic/publishing/Books-in-classical-antiquity -
The substitution of the codex for the roll was a revolutionary change in the form of the book. Instead of having leaves fastened together to extend in a long strip, the codex was constructed from folded leaves bound together on one side—either the right or the left, depending on the direction of writing. https://www.britannica.com/topic/publishing/Books-in-classical-antiquity -
in the 4th century, the Christian book had replaced the pagan book in every form. Several points in the Christian use of books contributed to a preference for vellum and the codex. https://www.britannica.com/topic/publishing/Books-in-the-early-Christian-era -
The medieval book was a codex written on vellum or parchment, although by the 15th century paper manuscripts were normal. Many medieval manuscripts had a lot of color and form and are known for their beauty. https://www.britannica.com/topic/publishing/The-medieval-book -
Books have not really changed from the 15th and 16th century, but many inventions have came across like audio books and other stuff. i think that some new inventions will come across and one idea is Ai reading where it can make a random book and story from different stories that have been published throughout time.