Backwards alphabetical-by-author

The first system I had where I live now - the home of most of my excellent systems - was backwards alphabetical-by author. I.e., by the last letter of the author's name. Arranged backwards, so that it went from Derrida and Mignola at the bottom right up to Lopez and Mahfouz at the top left.
The picture is from when I'd sorted out the anthologies and short story collections from the general order an put them first - in colour order.

Cons of this system: the symmetry that comes when all of one author's books stand together.

Pros of this system: Many.
- Consistency. The books could be properly ordered, strictly alphabetically. Very librarian, even if librarian-through-the-looking-glass.
- Guests could try to guess the system. Some of them actually even cracked it!
- Lots of books ending up next to each other as if they were meant to be there, in a way few could have anticipated. A few examples:
Firmin next to Small world. The Egyptologist next to An instance of the fingerpost. The wind in the willows next to Three men in a boat. 1984 next to Politics. Susanna Clarke, J.M. Barrie and Mervyn Peake hang out with each other. And so on; more examples (in Swedish) here.

So why didn't I keep this quite good system?
Because organizing books is fun.