As a color blind person I want to get on the OP is a monster train. But… I might actually have them beat for idiosyncratic cataloguing.
Until my wife hard vetoed it when we merged our libraries, I arranged my non-fiction by Biblical day of creation. I went back to Genesis 1 and sorted everything into nine broad categories, presented below in roughly the order they were catalogued in within each day.
Pre-Creation: Things which either textually or self evidently existed In the Beginning, ie before the seven days of creation. This is primarily mathematics, but in early versions of the system it included geology, hydrology, and weather. In later versions I included anything abstractly about gender as a topic, for C.S. Lewis related reasons.
Day 2: Oceanography, weather.
Day 3: Geography, botany.
Day 5: Marine Biology, ornithology.
Day 6: All other zoology, general biology, anthropology.
Post-Creation: History, art, so on.
I enjoyed this system which has been called ‘stunningly off-putting, even for you’ by some good friends and ‘I just brought you to church because I wanted you to have a healthy moral grounding, I don’t know where you got all this’ by my mom.
OP, you’re not a monster. I get you. In a general sense. As previously mentioned I am color blind so please do not rearrange my books.