This isn't about what to sort by, but how to place the books on the bookshelf so that they are in color order while minimizing the work of moving the books arou

This isn't about what to sort by, but how to place the books on the bookshelf so that they are in color order while minimizing the work of moving the books around to maintain that order as you add more and more books. More directly, I organize them by wherever I find space.