Concrete Ideas: Material to Shape a City is about possibilities in concrete architecture. It visually speculates, through a series of montages, drawings, and photographs, about concrete architecture’s capacity as an urban catalyst, its capacity for de fining cites and for virtuosity in urban renewal. It is another iteration of speculations begun in a graduate architecture studio at the University of Toronto, which asked: given the now mainstream nanotechnologies that transform the performance of materials at the molecular level without fundamentally changing the material aesthetic, can we anticipate and provoke a change in its inherent authority, perception, and aesthetic culture?