A friend was inquiring about how others dealt with writer's block that lasted over six months. My first response was, "Are you kidding?" Sure, assign me something and I'll get back to you, but the real writing muse only sings to me a couple of times a year.
I would agree with some of the other responses to the same question and say that writer's block is the result of too many things in one's head, not too few. White light only seems blank; split it, and you'll see just how many blue days, yellow days, and pink days went into making it. You can't unravel white light by focusing it. White light has to be broken.
So, rather than trying to put the whole world into our heads, we must put our heads into the world. Be not a lens, distilling the truth until it burns; be not a mirror, showing truth that has already been shown. Instead, write as a prism, unfolding old beauty in new ways, opening doors in the familiar, spreading light in colors as of yet unseen.