I made cordage! I used the inside phloem layer( had to look that up) of a fallen oak tree. It took several tries to figure out the reverse twist for the cordage then I thought 20 feet of this stuff, no way it must be 20 inches. But after completing 20 feet I realized how much more I learned about adding material, harvesting more and keeping a consistent thickness to the rope. It totally amazed me that I was making cordage out of tree bark.