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I organize mine by size, so I have my own version of crazy.

Spine size or cover font size?

It could be height (I used to do that as a kid).

My bookshelf has adjustable heights and putting all the tall books together means I make the best use of space.

Come to think of it I do that too. Ikea Ivar shelves!

Mine are by genre/topic, then by size and subtopic, at least on my big topical bookcase. We're not crazy!