Veil

I have always been attracted by the veil, by seeing through a glass, darkly:

And the children in the apple-tree

Not known, because not looked for

But heard, half heard, in the stillness

Between the two waves of the sea

- from Little Gidding, T.S. Eliot

When I was a child I caught a fleeting glimpse,
Out of the corner of my eye.
I turned to look but it was gone.
I cannot put my finger on it now