The Perennial Philosophy

This geometric diagram illustrates a mathematical proof, likely related to the doubling of a square's area as discussed in Plato's Meno. It demonstrates the early modern use of visual aids to clarify complex philosophical and mathematical arguments through spatial reasoning.

This manuscript page contains a carefully constructed hierarchical diagram that maps out philosophical or theological relationships. Starting from 'psyche' (soul) at the top, it branches into 'ousia' (essence), 'dynamis' (power), and 'energeia' (activity), demonstrating the systematic way early modern scholars organized complex metaphysical ideas.

A dedication page from a mid-16th-century scholarly volume printed in Basel by Adam Henricpetri, featuring a prominent historiated woodcut initial 'N'. The Latin text argues that the intellectual monuments of philosophers like Aristotle are more enduring than physical wonders such as the Pyramids or the Mausoleum of Halicarnassus. The initial contains a scene depicting a figure, likely a scholar or philosopher, amidst architectural ruins and foliage, reflecting the Renaissance interest in classical antiquity.

This hand-drawn diagram illustrates mathematical or musical proportions, a key element in Michael Psellos's interpretation of Platonic and Chaldaean thought. The use of red and black ink highlights specific relationships between the numerical values represented by Greek characters, demonstrating the integration of visual aids in Renaissance philosophical manuscripts.

A technical diagram mapping out fundamental musical intervals such as the octave (diapason), fifth (diapente), and fourth (diatesseron). This visual aid demonstrates the mathematical basis of harmony as understood in the medieval period, connecting arithmetic with the science of sound.

This diagram illustrates the Greater Perfect System of ancient Greek music theory as transmitted to the Latin West through Boethius's 'De institutione musica'. The three columns represent the three genera of melody—diatonic, chromatic, and enharmonic—listing the specific Greek names for each pitch within the system.

Historiated woodcut initial 'E' depicting a scholar or philosopher seated at a desk with an open book, pointing toward a globe or sphere.

This plate presents eighteen numbered geometric diagrams designed to accompany and clarify the mathematical arguments in Plato's works. The figures illustrate fundamental concepts of proportion and spatial relationships, which Plato considered essential for the soul's journey toward understanding the world of Forms.

This diagram depicts a geometric construction involving a circle and an inscribed triangle. Such illustrations were essential for readers to follow the deductive reasoning presented in classical philosophical texts, bridging the gap between abstract thought and visual proof.