A provocative look at the architecture of the future and the challenges of learning from the pastOpen Source Architecture is a visionary manifesto for the architecture of tomorrow that argues for a paradigm shift from architecture as a means of supporting the ego-fueled grand visions of �starchitects� to a collaborative, inclusive, network-driven process inspired by twenty-first-century trends such as crowd-sourcing, open access, and mass customization. The question is how collaborative design can avoid becoming design-by-committee. Authors Carlo Ratti and Matthew Claudel navigate this topic nimbly in chapters such as �Why It Did Not Work� and �Learning from the Network.� They also meet the essential requirement of any manifesto, considering the applications of open-source architecture not only conceptually but also in practice, in chapters such as �Open Source Gets Physical� and �Building Harmonies.� Open Source Architecture is an important new work on the frontlines of architectural thought and practice.