In the diary I kept during my visit to Uganda there is a stray sentence scribbled down on the inside back cover.

The pain can be seen in their smiles.

Strangely enough, I have to admit that I can’t remember when I wrote that. Who had I met? Whose smiles was I referring to? It seems to me odd that I can’t remember. I would hardly have made a note like that without good reason.

I scour my memory, but I cannot find the occasion or the cause.

How can I remember a smile without remembering the face?