This instrumental begins the concept of the "Chemical Playschool", a term which perhaps conjurs up images of mad-genius kids playing with various compounds in test tubes and the like. It could refer to the act of mixing different sound textures together to see what comes out, or the chemistry of different musicians working in different combinations - usually these are the more experimental sides of an already experimental band. It could also be a reference to the experimental nature of the combination of mind altering substances and music.
Chemical Playschool 1 and 2 is really just a "best-of" of the first couple of years of the Legendary Pink Dots.
Chemical Playschool 3 and 4 contains a "blueprint" for the album "The Tower", and several more experimental pieces.
Chemical Playschool 5,6, and 7 are, perhaps, lost in some other dimension. The press release for Chemical Playschool 10 sites that "Nobody would release volumes 5, 6, or 7 on the grounds of public safety."
Chemical Playschool 8 and 9 is basically an anthology release of rarities, compilation appearances, and unreleased material showing "the largely unseen universe of the Legendary Pink Dots between 1990-1995."
Chemical Playschool 10 is a special collection of new and unreleased material (recorded between 1992 and 1997) which was created especially for sale at shows on the LPD 1997 North American tour. After the tour, it was put into general release.
Chemical Playschool 11, 12, and 13 collects, finishes, and remixes unreleased bits and pieces from the entire history of the band's output and is mixed and produced by Edward Ka-Spel himself. There are no track breaks on these discs.
And finally, to add to the concept, Alchemical Playschool was released in 2006. The album was conceived at the end of the the Dots' 2004 North American tour. Edward Ka-Spel met with Soleilmoon owner Charles Powne, who had recently returned from a stay in India. Charles gave Edward a copy of his "Indian Soundscapes" 2xCD, and invited him to take the material and use it in a new Dots recording.