"Across the hills in the pop art blue"
Could I understand "blue" as sadness, depression, like "Across the hills in the sadness of the pop art" or something like that? How can I understand it?
This sentence is a quote from a song named Pop Art Blue from the band Zero 7.
I can't understand the "blue" of this part, which is in the name of the song as well.
The full lyric can be found in here: http://www.songmeanings.net/songs/view/3530822107858799922/