Last quarter, I was working with a graduate student on the Picatrix, without a doubt one of the craziest books of the Middle Ages. Translated from an actual Arabic archetype that falsely claims (in some manuscripts) to have been translated from the Greek, the Picatrix compiles knowledge from an enormous range of (mostly?) imaginary sources about the secret harmonies by which an adept can manipulate nature. This is the knowledge that the philosophers have hidden because they feared that the cosmos would be destroyed if it were more widely-known.
In practice, most of what the Picatrix contains is ritual magic of a sort not distinct in form – though much more elaborate in detail – from the recipes contained in the much older PGM. These spells take time and resources to cast; in a lot of cases, you’ve got to wait for an astrologically-defined “right moment.” These aren’t D&D spells, the sort of thing you could use to fight a frost giant or whatever.
That kind of magic, the sort you’d see in any fantasy movie, has more recent roots in a performance tradition that emerged out of carnivals and circuses in the 18th century. You’d go to a faire to see someone disappearing things or throwing fireballs. The “magic” was part of the show; presumably, the performers knew what they were really doing.
As Graham Jones argues in a recent book, one way in which performance magic built an identity for itself in the 19th century was precisely around this knowledge gap. Since an “enlightened” European audience was prepared to admire their skill, but not their supernatural powers (I’m reminded of the Epicureans of Lucian’s Alexander, who know there must be a trick behind Alexander’s wizardry but can’t be sure what it is), “primitive” colonials came to take up the role of the dupe. This was sometimes explictly the case, as when the French magician Robert-Houdin went on a tour of Algeria in order to show up the Isawi Sufis as fakes (or to demonstrate the superior mana of the French?). More generally, however, this opposition was one that inscribed itself in the early history of anthropology, which made hay through the mid-20th century out of the difference between the ethnographer’s rational grasp of phenomena and the native informant’s superstition.
More recently, scholars including Jones have come to doubt whether the indigenous suckers thus postulated really exist anywhere. It’s quite possible – and in many cases well-evidenced – that everyone, everywhere is in on the trickery behind this brand of performative, public magic, which nonetheless can be culturally meaningful in many more cultural registers than that of the Vegas shows and TV specials with which we’re familiar.
I wonder if it would be possible to talk about the kind of magic described by the Picatrix in a similar way. On the one hand, since such magic was often performed on behalf of paying parties by freelance ritual experts (e.g. Charles MacKay’s history of alchemy in The Madness of Crowds or the preface to Ficino’s Three Books on Life) it seems like there ought to be a similar gap between dupes and cognoscenti. On the other hand, what the cognoscenti know (if Picatrix can be believed) is actually just how to conduct the ritual itself; there’s no additional, secret manipulative know-how designed to produce an effect, as in modern magic.
As far as I can tell, the main way in which one of these practitioners would have tried to “put one over” on a client was by producing as elaborate a description of the ritual as possible, either in advance or while performing it. The purpose of that was to create as many “points of failure” as possible, so that, in the event that the ritual was thought to have failed, the magician would have someone to blame other than himself. This was a form of trickery that would by no means have come more easily to a disillusioned practitioner than to a true believer. Here, unlike in modern magic, an effective performance is totally compatible with belief in the efficacy of the ritual.
When ancient critics try to discredit magic, accordingly, they don’t bother claiming that it’s fake. Instead, they focus their attention on the causal agency behind the magic, which is usually – and especially by Christian sources – assumed to be demonic. You can get what you want with magic, the critics say, just at some cost to your soul. The to us more obvious critique – that there’s no such thing as magic – doesn’t particularly occur to them, just as it wouldn’t have occured to magical practitioners at the time.