Memari said he was working on a proposal for a bar that would install five tracking devices: one by the entrance, one on the roof, one near the cash register, and one in each of the bathrooms. That would allow the bar to know each person’s gender (from the bathroom trackers), how long they stay (“dwell time” is the official metric), and what they were there for (a drink outside or a meal inside). And targeted advertising for the pub could follow those people around London on Renew’s omniscient recycling bins.