When Domus approached Carlo Ratti to write an op-ed on the theme of opensource architecture he responded with an unusual suggestion: why not write it collaboratively, as an open-source document? Within a few hours a page was started on Wikipedia, and an invitation sent to an initial network of contributors. The outcome of this collaborative effort is presented in an article published in Domus in June 2011. The article is a capture of the text as of 11 May 2011, but the Wikipedia page remains online as an open canvas — a 21st century "manifesto" of sorts, which by definition is in permanent evolution. A year after the article's publication, in the summer of 2012, the idea of recapturing the text in its current state of mutation was born. However, it was not to be envisaged as a new publication, but rather a piece of the exhibition, Adhocracy, curated by Joseph Grima for the first Istanbul Design Biennal. The studio Carlo Ratti Associati envisioned a canvas on which a free flowing pen writes, erases and constantly rewrites the different versions of the Wikipedia page, indicating corrections, deletions and development of the manifesto in its continuous state of change. A vertical plotter on a large whiteboard welcomes visitors to the exhibition; its contents are generated in real-time from a script that constantly compares the various versions of the Wikipedia page. Starting each time from one of the numerous updates written online, the pen retraces its steps to incorporate all the users' contributions. Once it reaches the end, it begins once again, relentlessly in pursuit of the latest version of our open source manifesto, OsArc. For more information, and to read the article published in Domus (June 2011) visit: senseable.mit.edu/osarc For details of the exhibition Adhocracy, part of the Istanbul Design Biennal running until December 2012 visit: istanbuldesignbiennial.iksv.org/adhocracy Team: Carlo Ratti, Walter Nicolino, Pietro Leoni (project leader), Antonio Atripaldi, Giovanni de Niederhausern, Enrico Gueli, Franco Magni Special thanks to Officine Arduino / FabLab Torino

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1. opensource ??, and software, download ?