And, of course, that Google Glass is (for now) arguably as
plain as the nose on the face of the wearer while — notionally out of site (added — oops: I
meant «sight», but the pun almost works) so out of mind — it's easy to forget the likelihood that the same scene is being captured by the traffic surveillance cameras, the outward - looking surveillance cameras on the buildings in the area, perhaps the ATM camera
behind one, and the cameras & video recorders on the smartphones or tablets that the nearby tourists used to take pictures.