Colours change: in the morning light,
red shines out bright and clear
and the blues merge into their surroundings,
melting into the greens;
but by the evening the reds loose their piquancy,
embracing a quieter tone
and shifting toward the blues in the rainbow.
Yellow flowers remain bright,
and white ones become luminous,
shining like ghostly figures against a
darkening green background.

-  Rosemary Verey, The Scented Garden, 1981