I've always loved to make those lidded jars that are thrown in one piece, notched, and then cut apart to form lid and jar. (You can see one here.) I don't know why, but it never occurred to me before today that you don't have to stop with one notch! If you make two, or more, and then add bottoms between sections, you've got a set of stacking jars. Like so:
First, pull up a cylinder and collar it in until it is closed.
Then, with the fat end of the needle tool held at a 45º, press into the side of the wall 1/3 of the way up.
Then do the same thing 1/3 of the way down, and about 1/4 inch down.
Poke a pinhole at the bottom of one of those notches.
Tomorrow, when this gets to leatherhard, I'll show how I cut the sections apart and add bottoms to make stacking jars.