I just found this gem while looking at my YouTube subscriptions: Karsten Schmidt (aka Toxi) and Matt Wade from Moving Brands were interviewed for the launch of the Japanese book "Built with Processing". They speak a little about their general approach and then about a few specific projects.

The presentation of the KEF Muon project is perhaps the most compelling of the three included. But for long-time Processing heads the bonus of seeing the mythical Toxi in the flesh should be enough to warrant a few minutes of your time.