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| Introduction | ix |
| I. Thoughts on Life This section contains Leonardo's philosophical reflections, aphorisms, and personal observations on human nature. | 3 |
| II. Thoughts on Art Here, Leonardo discusses the theory and practice of painting, perspective, and the artist's role in society. | 59 |
| III. Thoughts on Science This section covers his observations on anatomy, botany, physics, and the natural world. | 141 |
| IV. Bibliographical Note | 193 |
| V. Table of References | 194 |