The Open Book is a crowdsourced, multi-author publication published by the Finnish Institute in London that contextualises an international movement for open knowledge in the words of the communities who are helping build it. What are the aims and motivations of open knowledge advocates, and how do concepts like digital transparency, open access, open data, digital ethics and the commons impact society? With contributions across sustainability, design, business and development, The Open Book offers a platform for discussion, and a launching pad for new ideas about the future of a global open knowledge movement in a time of rapid technological and societal progress