There are many cultures all over the world, including some of my own, who have used a form of reading bones. Like tea leaf reading, it is a tool to delve into what is showing up for the person who has requested a reading. It's a visual guide to deeper and deeper realms. It is possible to do this with bones only, a variety of small objects (what I have done), teeth only, wine sediment, coffee grounds, some cultures even read things like entrails from butchered animals or birds. It all leads to the same place. You and what's showing up for you.

You can find more information here is you wish to delve further: here and here.