This paper presents a simplified, quasi-physical model of how a leaf actually grows:

* Qinglan Xia, [The formation of a tree leaf](https://www.math.ucdavis.edu/~qlxia/Research/leaf.pdf), ESAIM 2007. 
 

Strikingly, the authors claim:

> Based on this model, we also provide some computer visualization of tree leaves, which resemble many known leaves including the maple and mulberry leaf.

Since this is science, let's reproduce their results!  

This will involve:

* Using this study group to go through the paper in detail
* Consolidate the gist of the model into a mathematical _specification_
* Develop this further into a functional specification for a leaf-plotting program
* Once developed, use the program to test the model
* Can we really make leaves that are close to maple, mulberry etc.?
* Make an "art gallery" of images, to include simulated and actual leaves