The concept of Matmos' The Ganzfeld EP, on which "Very Large Green Triangles" appears, is complicated. This is from its press release:

For the past four years the band have been conducting parapsychological experiments based upon the classic Ganzfeld ("total field") experiment, but with a twist: instead of sending and receiving simple graphic patterns, test subjects were put into a state of sensory deprivation by covering their eyes and listening to white noise on headphones, and then Matmos member Drew Daniel attempted to transmit "the concept of the new Matmos record" directly into their minds. During videotaped psychic experiments conducted at home in Baltimore and at Oxford University, test subjects were asked to describe out loud anything they saw or heard within their minds as Drew attempted transmission. The resulting transcripts became a kind of score that was then used by Matmos to generate music. If a subject hummed something, that became a melody; passing visual images suggested arrangement ideas, instruments, or raw materials for a collage; if a subject described an action, then the band members had to act that out and make music out of the noises generated in the process of the re-enactment.

The concept of the video is simple: It involves very large green triangles.

That is some balance right there.

In any event, this is the most listenable thing the duo has done in years and years. Sometimes they have sound lodged up their own asses - getting into other people's brains is a really nice change.