This etymology seems to refer to the material process of intertwining, chaining and sewing of papyrus sheets in order to make a volumen. It aims at explaining the word under the form βύβλος, not βιβλίον, and βύβλος refers properly to the papyrus as a plant or to an object made of papyrus, whereas βιβλίον always refers to the document, book or chart. Since in the time of Choeroboscus Ι and Υ were both pronounced [i], a confusion (either his or a copyist afterwards) was easy. Alternatively, if one takes βύω not in its proper meaning, but with the meaning "to secure" of the explanation (ἀσφαλίζω), the etymology may refer to the capacity of storing written information for a long time. In Choeroboscus' notice two different etymologies, βύβλος / βύω and βίβλος / βίους βάλλεσθαι, were sewed together to form a composite notice