The Leaf of an Elm Tree

[Don Schaeffer]

https://www.youtube.com/watch?v=VKSELJDSkeM
The variety of structures on the surface of a leaf is surprising and intriguing. Structures range from elegant and orderly to wild and broken. You can sometimes see expressive patterns in the flow of cells and connecting river-like tissue that runs through the leaf. It's a joyous adventure.