Seven (Or, How to Play a Game Without Rules) by Joanna Kavenna

The hapless narrator’s job is to help facilitate her work in “box philosophy”: “the study of categories, the ways we organise reality into groups and sets […] the ways we end up thinking inside the box, even when we are trying to think outside the box”.

https://www.theguardian.com/books/2026/jan/12/seven-by-joanna-kavenna-review-a-madcap-journey-to-the-limits-of-philosophy

Sounds right up my alley!