'Forth now, and fear no darkness!'

Me, an intellectual:

Case in point: Tsun Zu's rival defended a city with 10 men against Tsun's army of hundreds by disarming his own soldiers, dressing them in plain clothes, INVITING Tsun's army to come in, and it only worked because Tsun knew the guy was an ambush master and thought "if we attack the city he's inviting us into, we will die." and left without even trying ON THE BASIS OF HIS RIVAL'S REPUTATION AND NOTHING MORE

Another example: Tsun Zu, on being told his soliders were out of arrows during a battle against a city across a river from them, had his men craft scarecrows, put them on a boat, send it out on a line, leave it there for half an hour, then pull it back in and used the arrows the enemy had fired at the boat to restock their own ammunition. It only worked because it was foggy and the enemy couldn't tell the difference between the scarecrows and actual soldiers.

Hi hello! I have not become a missing person; I'm just in the middle of my ranger season and haven't had reliable access to WiFi. Daily activities have included! Night hiking, hunting for aquatic macroinvertebrates, quilting, mimicking gray-cheeked salamanders, mimicking fireflies, inadvertently attracting owls, avoiding elk, wrangling chickens, dressing in 19th century garb and baking cornbread on the hearth of a 126-year old house, other duties as assigned. A standard season!

Anyway, I saw this ren faire photo from user Shakespeare922 on reddit and had to turn it into twentysomething Boromir suited up for tournament. HAD to.

me: yeah i know, they’re all primary colors, it’s perfect

When you go for an MLS (Master’s of Library Science, which is a thing, and which is usually required for “professional-level” library work [which is also a weird and contentious concept that I won’t go into here]), one of the things you study is the organization of information. This deals with how to determine what a book or other material is “about"—a concept we tongue-in-cheek call “aboutness"—and how to convey that to a potential user of the item and make it easy for them to find. Things like keywords and subject headings, do I put this book about how often wild birds attack aerial drones in with books about birds or with books about technology, if its a fictional novel do I put fantasy in it’s own section or mix it in with all of the other fiction, so on and so on.

OP is organizing books by how they would look for them. OP’s partner is thinking in terms of aboutness. This is a system that works for OP because it’s their personal library: they know basically what books they own and they only own books that are relevant to them, and if they know what the book looks like, that can be a quick way to find it.

In a library that assumes the public (or people who do not own that particular collection of books) are using the collection, that doesn’t work. Books are often re-issued in multiple covers, or re-bound in new covers when they get worn out, and if the user doesn’t know what the book looks like or is expecting a different cover, they’re lost. That’s why non-personal libraries used standardized cataloging systems like the Dewey Decimal System or Library of Congress System to organize a book by what it’s “about”, and then put books about the same or similar topics together, marked with labels and signage so a person unfamiliar with the book or collection can find their way to it.

Basically, OP’s system works for their own personal library, because it’s best suited to how the primary user—OP themselves—looks for books. OP’s librarian partner is coming from a background of thinking in terms of a public-facing collection, where aboutness is the key criteria and communicating it to a user unfamiliar with the collection is the priority.