Imagine this scenario: You wake up in a bustling city and have breakfast with the guest you rented your spare room to. You then ride in a shared car to your job where you give tours of the city to out-of-towners. On your lunch hour you participate in a public transportation flash mob and after work you swing by a tool sharing center to finish a project. Once home, you enjoy a community meal at your neighborâs apartment and spend the evening packing for a trip using borrowed luggage that you found via your smartphone. Where are you? Would it surprise you if I said Seoul?