Moment.

Hughes, Star of Heaven, 1903

The painter should not become conscious of his insights without taking the way round through his mental processes. His advances, enigmatic even to himself, must enter so swiftly into the work that he is unable to recognize them at the moment of transition. For him, alas, who watches for them, delays them, they change like the fine gold in the fairy tale which can no longer remain gold because some detail went wrong.

Rainer Maria Rilke