Using public transport, we leave digital traces when checking in and out with our OV chip cards. Once our Bonus Card at Albert Heijn got scanned over the counter, we provide Albert with valuable information about what we like to buy and how often we do so. Even when getting our morning Cappuccino at Starbucks and using a discount coupon on our mobile phone, it’s all about moving data from one spot to another. In other words: we live in data-rich environments and our cities are gradually turning into ‘readable cities’. All that, based on the vast amounts of data which we ourselves perpetually produce.