If the brains at MIT succeed with their new project, walking down a city street could be a layered and information-rich experience in much the same way as browsing the web. Thanks to location-aware technologies and increasingly powerful mobile computing devices, the eLens project could enable people to explore their environment for extra information, added by others in a ‘tagging’ system like that used by del.icio.us, or feed back into the system by adding their own annotations to buildings and places. The potential of such a system to increase the utility of cityscapes is staggering.