Iconic thought and diagrammatical scripture: Peirce and the Leibnizian tradition

I will sustain in this article that Charles Sanders Peirce can be seen as the last great representative of that inconspicuous but persistent tradition that, from the thirteenth to the seventeenth century, spent its energies on discovering a universal language. His project of Existential Graphs is in fact grounded on the isomorphism among a Sheet of Assertion, in which graphs-signs are drawn, a Mind, with its thoughts-signs, and the Universe, with its facts-signs. In the same sense, Leibniz worked on his Characteristica Universalis, seen as a general Encyclopedia or alphabet of human thoughts, and a pictum mundi amphitheatrum.