Nest provides a high-level, simple scenegraph for Processing, modeled on the API for the scenegraph and display list implemented by ActionScript 3.
Nest is targeted toward developers familiar with AS3, who wish to organize on-screen objects in a display list hierarchy. As with the AS3 display list, Nest establishes parent-child relationships, applies parent transformations to children, and allows easy manipulation of on-screen objects through member variables such as x, y, rotation, and scale.
In addition to the scenegraph, Nest also includes an event-based communication system (built on the Observer pattern as implemented by Java's Observer interface), and some minimal UI components.