When I was a child, my mum used to sing a little folk song with me. Perhaps you know it. The beginning lyrics were, “I see the moon and the moon sees me. The moon sees the one that I long to see…”  

On a clear night, under the light of a full moon, that little childhood ditty will often come to mind. Of course, as a child, I thought that the one in the song was a special someone somewhere else in the world.

Years later, I often think of the one...