Arriving at an airport in a foreign land makes us aware of two things. The first is an immediate awareness of how much of this ‘new’ everyday life one doesn't understand. Taking a bus trip from the airport into town requires a ticket: where does one get one? Is it at an office or on the bus? If on the bus, from the driver or a conductor? Do you need the correct money, or do they give change? What are these coins, anyway; which is worth what? How do you get the bus to stop where you want to get off? Secondly, and less immediately, these experiences reveal how much ‘we didn't know we knew’ about how these things are done at home: that at home, these things are not a problem at all, but part of our natural and unreflective grasp of our circumstances.