1. Talkshow, 2007. Mapping a discussion between Aaron Koblin, Wilfried Houjebek, and Catalogtree as part of the Info Aesthetics Symposium organized by LUST (Netherlands, 2007). Coding by Lutz Issler.
2. Typopath 1.0, 2002. Mental Map of the Werkplaats Typografie. The form is shaped automatically by a basic set of rules.

From an interview by Greg J. Smith at Serial Consign:

Catalogtree is a multidisciplinary design studio based in the city of Arnhem in the Netherlands and formed by Joris Maltha and Daniel Gross. "We met at the Werkplaats Typografie (a 2-year graphic design masters program in Arnhem, NL) in 1999. We shared a great interest in generative systems and media independent design and worked on some web-sites together. We started as a webspace we shared with some friends. It's a technical term for filing structures - files within folders within folders, etc. We used it as a testing site for ideas and sketches in any media. We discussed projects and shared technical knowledge. Over time, as real commissions came in, it gradually turned into a portfolio site (though we still like to upload sketches) run only by the two of us. We only started using it as a name to work under a few years ago."

"If the data allows it, we like to break down information into a graphical hierarchy similar to poster designs: a larger motive or trend is visible at first glance, and more detailed information becomes clear on closer inspection."—Read more here.

Found in the book Area 1: 100 graphic designers.