The revival of this ancient memory technology traces back to Giordano Bruno’s “Art of Memory”, in which ideas, people, and images are inserted into the context of a house or palace with many rooms. This process was described and elaborated in Frances A. Yates’ wonderful book, “Giordano Bruno and the Hermetic Tradition”.
But the technique is of far more ancient origin. Cicero and Aristotle wrote of this technique, as did the famous Jesuit Matteo Ricci. They in turn provided the inspiration to Bruno, whose ideas were again brought to current awareness by Yates’ scholarly writings. And, as so often happens, these ideas were again “invented” by the writers of Sherlock, who surely were familiar with Bruno’s contribution, but who, in proof if their freedom from stuffy academic conventions, passed them on to us free of scholarly attribution.
This oversight is perhaps made more understandable when we realize that the inscrutable Mycroft Holmes, in his assumed persona of Mark Gatiss, is the producer and one of the writers of Sherlock. Surely he has some game afoot, if only we knew what it was…
Perhaps all will become clear in Season 4, if it ever materializes.