Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. site 
The Processing Environment includes a text editor, a compiler, and a display window. It enables the creation of software within a carefully designed set of constraints. page
> In Processing, a computer program is called a sketch. Sketches are stored in the *Sketchbook*, which is a folder on your computer.
See *gt4processing*. github (`PrSketch`)
