Nodes
Nodes are the rings on culm of bamboo that stick out anywhere from about 12" to 20". These rings must be dealt with in various ways to have a flat piece of cane to work with. A proper node dressing on a cane rod should be small, flat and not sanded through the surrounding power fibers. If not done correctly, you will have a rod that is not only unaesthetic to look at, but a wide variety of other problems. Nodes that are not straightened and pressed correctly can give you a rod that will never be straight. Lots of glue lines in the surrounding area of the node and Coke bottle looking dips in your rod blank.
Learning to do this properly is something that I really put a lot of time into. It took lots of shop time. Building blank after blank to get things right.
The next time you look into purchasing a bamboo fly rod, take a look at the node work. You can tell how much time and effort was put into a rod by this.