Speaking of music

There's this point in Radiohead's Everything in its Right Place where Thom Yorke sings, "There are two colours in my head." (Twice.) I've been noticing that I've always had a really strong mental image of which two colours he means; in fact, it was only recently that I consciously recognised that the communication of those two specifically was not objectively there in the song. So now I'm curious: if you, reading this, are familiar with the song, or have just heard it via that youtube link, do you feel like you know which colours they are? If so, which ones do you imagine?