A couple of other observations about the song, which I also mentioned my in my review.
1. The whole album, in my opinion, takes a few listens to really sink in.
2. This is very much an opening song that introduces the album. Stylistically it's the most typically-Haken song on the album, but it introduces musical themes and lyrical concepts that are explored in later songs. In particular, there is a glorious reprise of the chorus (though adapted) at the end of The Architect, and the main rhythmic motif is similarly reprised in a more atmospheric way to close off the album at the end of Bound by Gravity.
My point is, this song makes more sense as a part of the album. From that point of view, it's an unusual single choice, as other songs are more clearly defined on their own. I guess it was the "safe" single for fans who like their style.