A quote from Bjork

"You have 1,000 colors of emotion, and each album is one color exaggerated. It’s so exaggerated that it’s not me, but it’s one color, you know? And I feel like that color is in everyone."

Is she just being metaphorical or perhaps describing a cross-modal experience? Only she would know for sure.

Bjork.
by Mathias Augustyniak, Michaël Amzalag
Interview.
June 2011?
http://www.interviewmagazine.com/music/bjork/#/page4