At certain points in the history of architecture and urban planning, the disciplinary debate on how to apply new technologies surpasses the boundaries of the professions involved. At those times, the hopes and fears found in the disputes between architects, policy makers, engineers and planners are extended to a broader discussion about urban and societal change. Then, the central issue is not merely how to solve a specific spatial problem or improve a construction method with the help of a new technology. Rather, the debate revolves around its possible impact on urban society at large. What does this new technology mean for urban culture, what impact does it have on how we shape our identities and live together in the city? When those questions surface, Dutch philosopher René Boomkens argues, the professional debate has turned ‘philosophical’.