Phases I-IV was written more as private music for a purpose – a kind of Sleep Music that is more interesting than usual. This may make it less interesting for others. Therefore the album is offered for $1 (or more if you like).
The concept is similar to my Versions album. I wrote one piece, the other pieces were then phases of the first. One phase is the same notes exactly but with different sounds. The final two phases are built using existing phases as their sound backbone. I leave it to you to work out which is which – assuming that even matters as a new moon is the same moon all along.