Bookshelf

I have about a hundred something books on my shelf now, and I found it very interesting organizing them using different methods. It could be based on size, color, genre, author, or in no particular order at all. And I thought it is like math, each method is an input, and each book is an element, if you combine both, there could be, I don't know, trillions of possible arrangements on this bookshelf of mine. 

That's interesting. I just rearrange them, again, yesterday, and feel quite happy with the result. It will still take me time to find any particular book, and maybe one day, a mathematician could help me with what other arrangements I could use to diversify my tiny corner. 

🅣