She leaned over me, dark and mother-warm, and I could hardly breathe in her umbra of cigarettes and gin.
-- Jonathan Strahan, Eidolon
The umbra - shade, shadow, uninvited guest - is invited in; as a dream, the guest becomes host to a sensuous pleasure that is all the more real for being an imitation, and all the more an artifice for being imaginal, "only" a dream.
-- Patricia Cox Miller, Dreams in Late Antiquity: Studies in the Imagination of a Culture
Umbra is borrowed from the same word in Latin, meaning "shadow."