In a preliminary version of the demo, Famo.us physics engineer David Valdman showed me a representation of collections of balls with some basic physics attached to them.
Newcomb hopes that these components will someday be a part of WebKit itself so that Famo.us and other frameworks can manipulate these functions directly in the browser without the workaround.
The same design pattern in Famo.us could treat those side menus as a set of planes that could be manipulated in interesting ways and reduce the need for scrolling.