Gradually the songs began to come together, "Out Of The Cradle" among the first, along with "Vapor Trail," "The Stars Look Down," and "Earthshine." That last is notable for being the only Rush song I can recall that was later completely rewritten, keeping the same lyrics but replacing every single musical part. "Cradle" also underwent some serious surgery as time passed, and that was the kind of relaxed approach we were taking, allowing us to reexamine songs with the luxury of perspective, and repair or replace any parts that didn't survive that test of time. Sometimes a developing song seemed to lose momentum, or our faith (the critical force), and was abandoned, but that had always been our version of "natural selection."

-Neil Peart 2002 (on the construction of Vapor Trails)