Latecomers to the Krautrock party, Circles created a manifesto of frenzied inertia in the late 1980s, swimming in the same gene pool as Cluster and Popol Vuh. Ambient music for the end of time does not get any more authentic than this. "Structures" is a time capsule unlocked, containing previously unreleased recordings from 1985 to 1989. Music which meshes the extremes of "end of time foreboding" and "drifting lightness" to beguiling effect. Music which succeeds in sounding more contemporary now that it did when it was made.