This piece and its title emerged for me as I was playing with light and dark and a limited palette. The opening to Longfellow’s Evangeline had wormed its way into my ear and I kept hearing those lines: 

This is the forest primeval. The murmuring pines and the hemlocks,
Bearded with moss, and in garments green, indistinct in the twilight…

Yes, Indistinct in the Twilight. There it was.