The present paper first examines the layout of the two medical doxographies on papyrus known to this day – PLitLond. 165 (conventionally known as «Anonymus Londiniensis»), and PSI inv. 3011 – in order to establish the connections between written and non-written space in the presentation of authors’ opinions. The layout of these papyri is then compared to that of a medical papyrus containing doxographical sections (PMilVogl I 15), as well as of that of two philosophical doxographies(PSI VII 849 and PAnt II 85 + III 213). Finally, through a reassessment of a small literary papyrus (POslo III 169), this paper highlights the importance of devices such as “punctuation” (understood in a broad sense), for the identification and the understanding of the nature of a papyrological text.