Johnson 2009

bookrolls: books on papyrus rolls; first represention on a Greek vase, c5, but in use by Greeks at least 2000 years before that (256); columns laid out running left to right, always between ~2-3.5" wide, usually narrow; prose visually distinguishable from poetry

codex: c2-c4, replaces bookroll

papyrus: two-layer sheets made from papyrus pith; sheets not sold separately but glued left-right into rolls; much care given in putting together highest quality, which was often used for bookrolls

script: scribes payment based on quality of writing, written in "bookhand" with mostly separated letters for greater legibility; trained and apprenticed scribes; laid out scriptio continua (no spaces between words), with less elaborated punctuation, although markings are still evident at the end of sentences and major divisions in the text

• paragraphos: horizontal line at left edge of column, marks major divisions
• dicolon: like colon; marks changes of speaker in dialogue or drama

Maas's law: discovered by Paul Maas; bookrolls exhibit a forward tilt in the column, so that lines move slightly to the left as they go down; is a regular and deliberate feature (as we know from ruling lines) in Roman era, especially c2 and c3