Casey Reas co-created Processing, an open-source programming language and environment for creating images and animation. Reas began writing software to produce his own complex images, which take the form of prints, installations, and site-specific digital murals. “I write software to draw millions of lines in a few seconds,” he says, “to make thousands of calculations and decisions in a fraction of a second, to go beyond what my mind can imagine without its digital extension.” The abstract patterns and shifting structures contained within his images and animations explore ideas of transformation and evoke systems both organic and synthetic.