“Understanding precedes action.” That is the motto of the Urban Observatory, an interactive installation and web app created by TED founder Richard Saul Wurman that compiled a wide range of urban data for over 150 cities, allowing users to compare various characteristics of those cities – from population density to traffic speed limits – side-by-side. Urban Observatory was first created in 2013, a banner year for news about urban big data; later that same year, Waag made headlines with its interactive map visualising the age of every building in the Netherlands. The emergence of such platforms allowed people to see the world around them in new ways.