Davide Deriu’s photo-essay, On the Edge, inaugurates the new web issue published by the Canadian Centre of Architecture (CCA), which focuses on how different measures and regulations ensure or prevent safety in our built environment. This experimental image-text piece weaves together a series of photographs from the CCA collections that feature protective barriers such as handrails and parapets. It revisits prominent place in the canon of Western architectural history in order to explore how photographs can visualise the tense state of being on the edge. By disrupting the logic of the archive, the essay draws on the indeterminate character of fragments to provoke new insights and interpretations.