NATA NOVA, as Severyanin Igor wrote: "The Blue Flower doomed Novalis."
Blue as the color of dreams (kaemochka on a silver platter - an ironic look at the dream, rooted in everyday life), how it seems to me - so I was taught
- comes from the novel by the German Romantic Novalis' Heinrich von Ofterdingen. I give the link
http://www.novalis.ru/oftrerdinger.htm
From there also arrived, and "Blue Bird" Maeterlinck. And if the Estonian students do not know "saucer with kaemochkoy", then in general for their conceptual series do not worry - "Blue Dream" - a European context.