Imagine you go to a foreign country. You want to buy a train ticket. You walk to the station and go to the ticket machine. You see a dizzying array of levers,

Imagine you go to a foreign country. You want to buy a train ticket. You walk to the station and go to the ticket machine. You see a dizzying array of levers, buttons, sliders, and dials. Each labelled with diagrams which don't make sense to you. You back away slowly from the machine and try to find a human ticket seller. Have you experienced the machine?