The smart phone is a wonderful thing. We are never out of touch anymore, neither with friends nor with the world at large. But increasingly we read of the harm that it is doing us. We are no longer its masters but its victims. It makes us tense, anxious and insecure. We respond with unnatural haste to every noise it emits; and even when it isn’t peeping or squeaking at us, we neurotically check it all the time for messages that might have crept in surreptitiously.