The base of the stick is made up of random and very challenging monster encounters. The spokes on the left are the gates to the elemental nodes, while the spokes on the right are the returning points from the nodes.
In the middle of the hub is Hedrack, and each of the spokes takes you to each of the four elemental nodes. Metaphorically, this dungeon is an art piece, a stick being held up by a perpendicular base on the ground.