Casey Reas is an artist and co-creator of Processing, regarded as one of the most influential figures in modern generative art and creative coding.

When Processing was first begun in 2001, it was made as a sketching language. We called it a sketchbook. And I think that was one of the primary ideas of the software.
Casey Reas, 2000s Tooling Era: Casey Reas, Golan Levin, Christiane Paul
We acquired a work by Casey Reas in the early 2010s from his Process series. It was essentially a digital file. It didn't come with the hardware.
Douglas Dodds, Douglas Dodds on Collecting Digital Art at the V&A