Summary Visual representations were deeply involved in medieval traditions related to the dissemination and teaching of philosophy and science. Consequently, they were not only examples of theological or philosophical interpretation, but rather brought together manifold intellectual activities, illuminating various perceptual, cognitive, and spiritual concerns. Visual tools, which appear frequently in medieval manuscripts, have often been considered as ?illustrative material? intended to facilitate the comprehension and interpretation of texts. These ?visual aids? offer something more than a straightforward correspondence between a conceptual interpretation and its figurative depiction. They are, in fact, key to understanding the methods of acquiring and shaping knowledge through visual frameworks with didactical, disputational or heuristic purposes. The aim of this volume is to deepen our understanding of medieval visual tools that represented and demonstrated philosophical and scientific knowledge and, to an extent, the accumulation of empirical information. TABLE OF CONTENTS Jos Higuera (UNED), Introduction Diagrams & Graphics Roberto Hofmeister Pich (PUCRS), Dialectics, Visual Tools, and the Methods of Learning: Exploring ?Visual Cognition? in Manuscripts on Logic by Jesuits Masters from Ecuador (17th-18th Centuries) Pippa Salonius (Monash University), Ordo and Nature: The Trees of Sculpted Narrative at Orvieto Cathedral Albert Soler (UB), Ramon Llull and the Ars Diagrammatica Astrology & Geomancy: Visual Tools Arianna Dalla Costa (Warburg Institute), Lunar Mansions as Celestial Images in the Thirteenth-century De signis Astronomicis Alessandro Palazzo (Univerist di Trento), Images and Visual Tools in the Geomantic Treatise Estimaverunt Indi Visio et cognitio Maria Manuela Brito Martins (Universidade Cat lica Portuguesa), Repr sentations et sch mas graphiques de la species visibilis dans le De homine d'Albert le Grand Peter John Hartman (Loyola University), John Pouilly and John Baconthorpe on Reflex Acts Paula Oliveira e Silva & Jo o Rebalde (IF-UP), The Diagram of minima naturalia in Marcos Jorge's Commentary on Aristotle's Physics (Physics, I, 4) Nicol s Vaughan (Universidad de los Andes), Ockham and Wodeham on Perceptual Experience Tamar Tsopurashvili (Ilia State University), Eckhart's Metaphysics: The Example of Predigt 9 Luciano Micali, Visual Perception and Knowledge of God in Jean Gerson's Tractatus de oculo Visio et experientia Yael Barash (Cohn Institute-Tel Aviv University), Using Visual Conventions to Depict a Visionary Experience: The Illustration of Vision II of Hildegard's Liber divinorum operum in Lucca Codex Francesca Galli (Universit della Svizzera Italiana) Through the Mirror. (Super-)natural Properties of Reflecting Surfaces in 13th-Century Scientific and Theological Thought (Open Access) Jos Higuera (UNED) The Visualization of Motion: Averroes and Albertus Magnus