analysis of my bookshelf, the categories -

1. Order in disorder -topics typically include  chaos, cybernetics, Complexity - Melanie Mitchell, Model-thinking , Ashby,  Alvin Toffler, Drucker, Godel Escher Bach, Winkless/Browning. All hard science,tech books are a hard subset of this.

1.1. all hard tech/science books - feynman, android-zechner, sicp, paip,see 1above

2. Philosophy - this might as well be a primordial form of 1. This category can be a subset of 1. McLuhan,  Deleuze & Guattari, 

3. War & Conflict - The Art of War, On War, Certain to Win, Games of Strategy, any printouts on ooda loops, Book of Five Rings

4. Economics and wealth - psychology of money, intelligent investor,  how stock markets work, cartoon guide to economics 1 & 2, wealth of nations

5. Psychology - books on habits - this is still a subset of 1, William James

6. Health & Human condition. - graeber, fung , yoga books. meditation practice printouts and books, toffler, systemantics

7. God/Hypotheses/Heuristics - multiple books on Zen, Gita versions,Vaishnavism, multiple books by Buddhists.    It's a toss-up whether the practice parts of these books end up in 5 or 6   or here. Works of Vivekananda ( some works border on 1)

*keep the meta books in each category in the right end of the shelf'

** freakonomics seemingly combines 4,5, and 6, wgibson 1.1 and 6

Philosophy, and its children, science, math, logic, language & grammar  .. etc seek the order in the seemingly disorderly

Art seeks to express the orderly using seemingly disorderly & chaotic elements

art if a way of understanding and learning, and thinking beyond ( somebody quoted this)