The album's title is derived from Swedish director Vilgot Sjöman's films I Am Curious (Yellow) (1967) and I Am Curious (Blue) (1968).
The hollow trunk of the tree was the location for sex scenes in I Am Curious (Yellow), a 1967 film by Vilgot Sjöman.
Vilgot Sjöman's film Ingmar Bergman Makes a Movie was made simultaneously with Winter Light and documents its production.