The Books Behind Natural Magic
Which Renaissance scholars shaped the ideas Diana may now be beginning to explore?
This week, I keep coming back to one question:
If Diana is beginning to explore natural magic, whose ideas is she really stepping into?
When we hear the phrase “natural magic,” it can feel distant or abstract. But for scholars living in the sixteenth century, these ideas were part of a serious attempt to understand how the world worked. The boundaries between science, philosophy, theology, and what we would now call magic were far less defined than they are today.
Natural magic was one way of describing the hidden connections between things. It reflected a belief that the universe was structured through relationships linking plants, animals, elements, and even the heavens into a single, interconnected system.
If someone in Tudor England wanted to study these ideas, they would not be inventing something new. They would be reading from a set of books that circulated widely among scholars across Europe.
And again and again, two names appear.
Heinrich Cornelius Agrippa.
And Giambattista della Porta.
Agrippa and the Structure of the Universe
Heinrich Cornelius Agrippa was writing at a moment when Europe was rediscovering ancient philosophical texts and trying to make sense of them within a Christian framework. His most influential work, Three Books of Occult Philosophy, first published in 1533, attempted to bring order to centuries of scattered ideas.
Drawing on classical philosophy, medieval mysticism, and Renaissance scholarship, Agrippa described a universe built on layers of correspondence. The visible world reflected deeper realities, and everything—from stars to stones—was part of a larger pattern.
Understanding those patterns, he argued, was the key to natural magic.
This did not mean controlling supernatural forces in the way modern readers might imagine. Instead, it meant recognizing relationships that already existed and learning how they interacted. Once those patterns became visible, a scholar could begin to work within them rather than against them.
Agrippa’s ideas spread widely. His book circulated through libraries and private collections, shaping the way Renaissance thinkers approached both science and magic.
Della Porta and the Practice of Observation
A generation later, Giambattista della Porta approached these same ideas from a different direction.
Where Agrippa focused on structure, della Porta focused on observation.
His book Natural Magic, first published in 1558, reads less like a formal system and more like a guide to noticing. He described unusual properties in plants, animals, and minerals, suggesting that careful attention could reveal patterns that were otherwise easy to miss.
Some of his work explored optics and early chemistry, while other sections reflect the Renaissance fascination with hidden knowledge. But throughout the book, his approach remains consistent.
Nature itself holds the answers.
The challenge is learning how to look closely enough to see them.
A World That Had Not Yet Divided
What these books reveal is a world that had not yet separated knowledge into distinct fields. There was no clear line between science and magic, or between observation and belief.
A scholar might study astronomy and alchemy in the same afternoon, seeing both as part of the same effort to understand the structure of the universe. Mathematics, philosophy, and natural magic were all connected, each offering a different way of approaching the same questions.
Knowledge was not divided into disciplines.
It was part of a continuous search.
Books in the World Diana Has Entered
These ideas did not exist in isolation. They lived in books that moved between scholars, carried across countries, copied, debated, and reinterpreted.
Figures like John Dee collected thousands of volumes on mathematics, astronomy, alchemy, and natural philosophy. Libraries became places where ideas gathered and where connections between different fields of study could begin to take shape.
This is the world Deborah Harkness knows deeply as a historian.
And it is the world Diana has stepped into.
Seen from this perspective, the magic Diana begins to encounter in The Black Bird Oracle starts to feel less like an isolated family inheritance and more like part of a much larger intellectual tradition—one that scholars had already been exploring for centuries.
Returning to the Question
If Diana is learning natural magic, she is not beginning from nothing. She is entering a conversation that has been unfolding for generations.
She is stepping into a way of seeing the world that assumes everything is connected, that patterns exist beneath what we can immediately see, and that knowledge has the power to reshape how we understand those connections.
Which brings us back to the question.
If Diana is beginning to explore natural magic, whose ideas is she really stepping into?
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