So late last night I read Geoff Manaugh’s BLDGblog entry about “the City of Retroactive Mathematics,” and made the above animation. It’s composed of three elements: a light source, two spheres of different sizes, and the imagery. Prior to reading his article I was about to make the next Rochester map, so I continued using the Rochester imagery to create what looks like a urban molecule giving birth to a smaller version of itself. Would that be an asexual city?