Heavy psych made by a commune. Like a mutant version of Hawkwind; a band with whom they shared a bassist. Not much outside of Black Sabbath was darker than this when it was released in 1970. Part of the primordial ooze from which metal emerged. This is their experimental magnum opus, up there with the likes of "Tago Mago" and "Faust IV" in the krautrock canon. Dark, sprawling, weird, and singularly unique.