Full Idea
Lull proposed a combinatorial art. He wanted to reconcile Islam and Christianity by articulating the basic concepts that their belief systems held in common, and then inventing a device that would allow these concepts to be combined.
Gist of Idea
Lull's combinatorial art would articulate all the basic concepts, then show how they combine
Source
report of Ramon (Ars Magna [1305]) by Richard T.W. Arthur - Leibniz 2 Intro
Book Reference
Arthur, Richard T.W.: 'Leibniz' [Polity 2014], p.27
A Reaction
Leibniz's Universal Characteristic was an attempt at continuing Lull's project. Lull's plan rested on Aristotle's categories.