The Desires of Prepositions

I’ve been using the phrase desires of prepositions¬†without explaining what I mean. Partly I did this because I’ve had to work my head around the idea. It started with an intuition and some amusement over the juxtaposition of two terms that are usually not used together in the same conversation, much less the same sentence or phrase. (Aside: I just googled “desires of prepositions” with the quotes