All TEXT is is potential. That's evident from images of medieval manuscripts where the notable letters, the flourished initials, have been left unfilled. It's evident from the spaces left by the marginal annotators who never came to engage with the main work filling the central writing grid. It's evident from the neglected texts, the literary orphans, that excite no critic to interpret them.
All text is, then, is potential.
London, British Library, Additional 37517, f. 135v