That is, some of my friends growing up tend to draw, you know
whenever. Start a sketch, doodle in class, pick up something,
refine it, etc. Anyway, these folks end up getting really good,
less out of diligent patience than iterated and distracted
practice. […]

For a process to be sketchy, or like sketching, it should:
- be immediate, quick to engage or start up in
- be incremental, easy to save and resume working on

Maravillosa definición de lo que es un software sketchbook. Lo dice graham coleman acerca de chuck. 100% aplicable a processing.