The best known of Ong's theses is Ramus the post-Gutenberg writer, in other words the calibration of the indexing and schematics involved in Ramism to the transition away from written manuscripts, and the spoken word. Extensive charts were instead used, drawing on the resources of typography, to organise material, from left to right across a printed page, particularly in theological treatises. The cultural impact of Ramism depended on the nexus of printing (trees regularly laid out with braces) and rhetoric, forceful and persuasive at least to some Protestants; and it had partly been anticipated in cataloguing and indexing knowledge and its encyclopedism by Conrad Gesner. The term "Ramean tree" became standard in logic books, applying to the classical Porphyrian tree, or any binary tree, without clear distinction between the underlying structure and the way of displaying it; now scholars use the clearer term "Ramist epitome" to signify the structure. Ong argued that, a chart being a visual aid and logic having come down to charts, the role of voice and dialogue is placed squarely and rigidly in the domain of rhetoric, and in a lower position.