Novalis's 'blue flower' is the undying example … 'a basin of water emits a faint blue light' … 'drawn to a tall light-blue flower. The flower then leaned towards him and … upon a great blue corolla, hovered a delicate face.' Novalis regarded the blue flower as 'the visible spirit of song.'
Hillman identifies Novalis's blue flower as the archetypal Romantic symbol of imaginative longing, grounding it in the alchemical-aesthetic tradition of blue as the color of spirit and song.
, Alchemical Psychology, 2010thesis