
This unique and brilliant book is a history of human knowledge. Before the invention of printing, a trained memory was of vital importance. Based on a technique of impressing 'places' and 'images' on the mind, the ancient Greeks created an elaborate memory system which in turn was inherited by the Romans and passed into the European tradition, to be revived, in occult form, during the Renaissance. Frances Yates sheds light on Dante's Divine Comedy, the form of the Shakespearian theatre and the history of ancient architecture; The Art of Memory is an invaluable contribution to aesthetics and psychology, and to the history of philosophy, of science and of literature.
The other day someone on here recommended The Philosopher's Toolkit, and I ordered a copy based on that recommendation. I've only started to dip into various parts, but I can already confirm that it is a good introductory compendium of the basics of philosophy, logic, and argumentation. In the same vein is Daniel Dennett's Intuition Pumps and Other Tools for Thinking.
A personal favorite is Frances Yates's The Art of Memory (think: intersection of rhetoric, mnemonic systems, philosophical systems, and the occult during the Renaissance).
Matthew Butterick's Practical Typography and Typography for Lawyers. Bryan Garner's The Winning Brief.
Umberto Eco's How to Write a Thesis. Adler's How to Read a Book. Pierre Bayard's How to Talk About Books You Haven't Read.
I could go on. Book posts are my favorite posts on HN, but they always lighten my wallet and at home I'm surrounded with ever-growing piles of great material.
Although I'd say traditional mnemonic devices like memory palaces are basically linear information storage and recall devices. This can create issues in building a flexible web of information, because loci or the order of the path can become dependencies and you can run out of unique spots in a given space, leading to memory interference.
Even spaced repetition methods (e.g. Anki) tend towards fragmentation of micro-ideas. Its perfect for terms, languages, and simple one question -> one answer ideas.
I've found a hybrid method of images, nested loci and spaced repetition to be most useful, because its flexible over time, and preserves relationships of ideas.
(Context: I co-founded a SaaS in this space: www.sticky.study)
Memory has been long thought to be a critical component of intelligence, with elaborate mnemonics systems developed by people to help memorize more things (see Francis Yates' The Art of Memory, and to a lesser extent her book on Giordano Bruno).
I would contend that memorizing concepts is a first step in understanding them. Also, that generally understanding concepts isn't a one and done thing, usually there's layers. Personally I found that memorizing things in math helped me immensely when years later I needed to actually understand the things I had memorized.
The Art of Memory by F.A. Yates is still a nice read.
In the article, the engineers admired by the author were intel ops who were stuck in an airgap and had to use their minds. That's a principle I try to use in life - to some extent deliberately making things hard for myself. As with all exercise, what was impossibly hard becomes commonplace.
Part of this discipline is knowing what not to do (yes, attic theory). I never create new accounts on anything or unless I've a clear cost-benefit rationale that makes memorising a new 32 character passphrase worthwhile. That excludes a huge heal of crap that wants you to "sign up" for it.
Regarding your question about why this works : I urge you to read at least the first chapter of Frances Yates The Art of Memory https://en.wikipedia.org/wiki/The_Art_of_Memory - how people learned to retain vast stores of knowledge before the invention of the printed page.
