Also often abbreviated as SAW2, it’s the second album of Richard D. James and it was meant as a second volume of Selected Ambient Works. This album is seen as more proper ambient record than the first one because it features lengthy, textured sounds with minimal percussion.
The unusual thing is that the album consists of 25 tracks that are all officially untitled. There is one exception from this with one track called “Blue Calx”.
More Info: Aphex Twin – Selected Ambient Works Volume II (Amazon)