Absolutely brilliant - I have been mulling over this problem in a very abstract way for a long time, knowing what it was but not how to express it, and wishing

Absolutely brilliant - I have been mulling over this problem in a very abstract way for a long time, knowing what it was but not how to express it, and wishing I could come out with a comparison as accurate and eloquent as this, and here it is. Well done pg, well done.