What is this equation?

There’s an artist by the name of Eve Andree Laramee that pierced a leaf with a mathematical equation. Any scientific people out there who know that this equation means or what scientific principle it represents? The artwork is called “Bifurcation”. I tried finding a description on her website but couldn’t find a thing. Here’s the link: http://home.earthlink.net/~wander/sitebuildercontent/sitebuilderpictures/laramee-leaf.gif Thanks!