Alejandra Gómez Ortega has been touring the campus with her ‘cash dispenser for data use’. Her mission: to make it clear what data you leave behind online. The ‘Dataslip’, as Gómez Ortega prefers to call it, is similar to a supermarket cash dispenser, but slightly more brightly lit. Instead of entering an amount of cash, users answer a brief series of questions about their daily lives. What apps are on their phone? Do they use a loyalty card? Based on their responses, the Dataslip prints out a slip. This shows which data their apps, loyalty card and other cards or passes are recording. It issues some people with slips as long as their arm and others that are two metres long.