What a weird and intriguing book.
This is, ostensibly, a history of the art of memory. The author emphasizes in her preface that she is using the word 'art' in its original Greek sense of 'practice', of techne. The art of memory, therefore, is the conscious training of the powers of recollection.
At first glance, this strikes one as a very strange subject to write about - the author admits as such. In our epoch of proliferating and instantly available information, to write a book about the art of memory seems about as productive an endeavor as writing a biography of the Rubik's cube.
But the author's aim is deeper - the information era is historically very recent. Prior to that, knowledge and memory were densely interwoven, and conceived as such. Thus, what begins as the straightforward history of a niche skill, slowly iterates into an unpacking of the evolving conceptions of both knowledge and memory. The evolution of a technique cannot take place without an accompanying evolution of the basic material of that technique.
This book is definitely a slow burner, though. The first half of the text mildly irritates the reader. The author deploys her resources carefully, conscientiously adhering to her brief viz. the unpacking of the ancient art of memory, as the ancients themselves conceived of it. Minute variations of this fossilized art dominate the succeeding chapters, and the overwhelming sense the reader gets is 'OK, well, this is kind of interesting, I guess. But what's your point?'
But there is a plan at work behind the scenes. The art of memory begins its life humbly as a mere appendage of the classical art of rhetoric. It is all very good to be eloquently inventive, but this comes to naught if the speaker can't remember the main points of his argument. The speaker must remember, but, more importantly, must train his memory to remember well and more. The best way to do this is to make use of those primordial engines of human memory - image and place.
This is the essential importance of the classical tradition - that it identifies the faculties of imagery and place as training-wheels of the human imagination. The subsequent evolution of the art of memory returns again and again, leitmotif-like, to these twin substrates.
With the advent of medieval scholasticism, the art of memory becomes transfigured. It is now no longer to be sullied with such banal concerns as rhetoric, but is to be applied to the contemplation of eternal truths. The classical art's emphasis on image and place is retained; but the images are now to be grotesque representations of the virtues and vices that either help of hinder the soul. These caricatures are to be arranged in a well-ordered space, a Gothic cathedral for example. Here, a niche technical skill transforms into a spiritual exercise - for, as Aquinas says, the unsubtle human mind might intuit subtle spiritual truths through a modified memory-training program.
When we come to the Renaissance - the last era before the Gutenberg revolution - the art of memory becomes transformed again. Two developments occur here that ensure that the art of memory survives into the modern era, in a form so subtle that would have astonished the ancients ; this at least is the author's contention. Firstly, the general humanistic vibe of the Renaissance meant that the medieval emphasis on sin, virtue, and purgatory - and the 'fixing' of these on memory coordinates. - is rubbished. This did not mean that the art of memory training was to be disabused - on the contrary, the tool was valuable, it was just directed towards perverse ends. Memory-training can now be in service of a truly universal consciousness, which has no place for medieval hang-ups.
This strand of thinking regarding the classical art is represented by the Italian heretic, Bruno - the latter gets a full 3 chapters to himself. That images aid memory is a given - but what kind of images? And what kind of memory, i.e. what is to be remembered? What follows is a delineation of one of the most impressively absurd mnemotechnic - revolving wheels of archetypes (and what is an archetype, if not an image?) and constellations, serve to train the memory towards a universal consciousness.
The second aspect of the Renaissance impact on the art of memory, is a distrust of images. This stems from the iconoclasm of the Protestant Reformation - here too, the art of memory is to be retained, but its emphasis on imagery is to be disdained as belonging to a lower human faculty. The imagery that is to be retained, however, is imagery of a more abstract sort - the imagery of an argument's structure, for example. Or even, new symbols denoting causal relationships - an incipient calculus.
There are plenty of these kinds of insightful offshoots. Some are explicitly expressed by the author - the above-mentioned origin of mathematical notation, the proliferation of intensive religious imagery in medieval art, the changing architecture through time parallel to the evolution of memory training. But most others need to be reflected upon by the patient reader, unpacking the implications of what is, at first glance, a scholarly digression on a niche technical skill.
In sum, I found this book very strange - as mentioned, it is a bit of a slow burner. Additionally, I wasn't quite sure how to judge the author's connections and conclusions. It seems to me too much of a stretch that a private mental training activity could have such profound implications for intellectual and material culture. At best, I would say that such an activity was but one of the streams that led to a revolution in the psyche following the Renaissance.
But my inability to validate the author's musings has as much to do with my unfamiliarity with the field - this book is a slog, not only because of the author's patient erudition, but also due to the unfamiliar context. Few modern readers are familiar with the topic under discussion, and even less familiar with the historical contexts in which the art of memory undergoes transformation, with supposedly profound effects. It is a book dealing with a forgotten subject in an obscure era.
But, I still came away thinking that there must be more to unpack. Like some other great works, this seems to be a book that repays revisitation at different points in one's life. I would recommend it for someone willing to exit their comfort zone.