So now I've listened to it all. I find all tracks trippy, but "Screwdriver" and "Scotty's Name" don't pack the punch and clarity of the others, which are top notch. This music is based on heavy usage of layered percussion and trippiness, repeating itself constantly without ever repeating, constantly morphing into something new. However, my words don't do this classic any justice, so just buy this and listen! Spectacular.
Favorites: Questionmark, Ant Invasion, Trippy Future Garden