Joint based series with basic shapes:
This robot is based upon a cylinder.
More evolved legs, much stronger and more stable.
I really like this series, it's too bad it takes some much time to create the total series.
This one is much more stable and can stand on its own.
In its simplest form, a cylinder (from Greek κύλινδρος – kulindros, "roller, tumbler") is the surface formed by the points at a fixed distance from a given straight line called the axis of the cylinder. It is one of the most basic curvilinear geometric shapes. [source])(https://en.wikipedia.org/wiki/Cylinder)
So here is it: