From the other side: I worked for one of the on-demand valet services in SF for a few months a few months ago. Basically I loitered around on the street all d

From the other side: I worked for one of the on-demand valet services in SF for a few months a few months ago. Basically I loitered around on the street all day, waiting for my company-issued iPhone to send me running or biking to either pick up someone's car or return it. What was driven (ba-dum) home to me was how buildings in a city are built defensively, to keep out the riff-raff (myself being a member of such). The implications are somewhat worrying.