Seven years ago, MIT debuted a landmark project, which allowed everyday people to photograph and rate their streets like a Hot or Not for cities. It was a powerful showcase of how crowdsourcing opinions from citizens could help quantify a city’s appeal and, in theory, help urban designers plan better cities. Less than a decade later, artificial intelligence is taking this idea so much further. FaceLift is a new AI system developed by Nokia Bell Labs Cambridge that allows scientists and urban planners to use a crowd’s aggregated sensibility to actually redesign the look of city streets.