The technique is called, Kimekomi and is a Japanese craft from around the first half of the 18th century. The original items were carved in wood and then the fabric was pushed into the grooves. You can do a search on the web and read about it.
I started with a book and read it twice lol. Here is a small tut of how it goes together. First you divided the ball into section according to instructions. Then you trace two or three shapes between the sections. Then you cut into the lines, 1/2 inch deep.
These are the pattern pieces for this ball, which is a 4 inch ball. The pattern consists of the batting patt and the fabric patt.
After the fabrics are all in, the rattail cording is glued on. A hanger is optional.
Here are a couple other patterns that I did on 3 inch ball.
I will be demonstrating this technique at the The Sewing Studio Super Fabric Store on the 16th of July, when they have their, Christmas in July special.