Cute Young Blonde Girl Reading A Book On The Old Couch

Wax tablets were the normal writing material in schools, in accounting, and for taking notes. They had the advantage of being reusable: the wax could be melted, and reformed into a blank. The custom of binding several wax tablets together (Roman pugillares) is a possible precursor for modern books (i.e. codex). The etymology of the word codex (block of wood) also suggests that it may have developed from wooden wax tablets.
In the 5th century, Isidore of Seville explained the relation between codex, book and scroll in his Etymologiae (VI.13): "A codex is composed of many books; a book is of one scroll. It is called codex by way of metaphor from the trunks (codex) of trees or vines, as if it were a wooden stock, because it contains in itself a multitude of books, as it were of branches."
• Middle Ages