"For twilight, the time between times, brings true grey, the colour that exists in its own right. Even the word itself, twilight, carries a gentle and lyrical sound, the time between lights, the greater light of the sun and the lesser light of the moon. Here is the moment of the changing of the guard between these two luminaries. It is a fragile time of transition, half-light and half-dark - it is mysterious, ambiguous. It is the time of uncertainty, given to us daily as a reminder of the reality of the between-time.
It is an image from which we can learn so much, and it falls to the poet to tell us what this gift can mean. When Andrew Motion, the former Poet Laureate, was asked to turn The Wind in the Willows into a ballet libretto, he discovered an aura of mystery there that finds its way into these lines*, spoken by the actor playing the author Kenneth Grahame as he emerges into the attic and looks around at the audience:
Here I am, just here. Awake
But dreaming. In the attic of my home -
And nothing is quite certain any more.
Is this grey twilight or the dusty air?
You see? You can't be sure. And nothing's sure.
Inside my head. I'm like a ghost that floats
Between two worlds ..."
Esther de Waal, Living on the Border: Reflections on the Experience of Threshold
*See more here.