15th Anniversary 3CD Deluxe Edition of the Orb's genre defining debut from 1991 Disc One and Two contain the original album Digitally Remastered. Disc Three contains the John Peel session from December 1989 which was the most requested session in the history of his show. Also included is the Andrew Weatherall, vinyl-only, "Ultrabass II" mix of "Perpatual Dawn" and 5 of the Aubrey Mixes which were deleted on day of release in 1991.

CD 1:

1. Little Fluffy Clouds - 4:26
2. Earth (Gaia) - 9:48
3. Supernova At The End Of The Universe - 11:56
4. Back Side Of The Moon - 14:15
5. Spanish Castles In Space - 15:06

CD 2:

1. Perpetual Dawn - 9:30
2. Into The Fourth Dimension - 9:16
3. Outlands - 8:23
4. Star 6 & 7 8 9 - 8:10
5. A Huge Ever Growing Pulsating Brain That Rules From The Centre Of The Ultraworld (Live Mix Mk 10) - 18:43

CD 3: Peel Session & Aubrey Mixes

1. A Huge Ever Growing Pulsating Brain That Rules From The Centre Of The Ultraworld (Peel Session) - 20:14
2. Perpetual Dawn (Ultrabass II) - 7:12
3. Little Fluffy Clouds (Cumulo Nimbus Mix) - 6:39
4. Back Side Of The Moon (Under Water Deep Space Mix) - 8:42
5. Outlands (Fountains Of Elisha Mix) - 8:39
6. A Huge Ever Growing Pulsating Brain That Rules From The Centre Of The Ultraworld (Aubrey Mix Mk 11) - 7:13
7. Spanish Castles In Space (Extended Youth Mix) - 13:39