Harmony in Ultraviolet

All the pieces are by Hecker, with Denis Blackham mastering and Jonathan Parent playing organ stabs on tracks 13 and 14. The title refers to Matisse's 1908 painting Harmony in Red, and ultraviolet because the radiation is invisible; Hecker told Cyclic Defrost in 2007 that he liked the immateriality of ultraviolet in the sense that it is undetectable. The cover is his photograph of the Monument to Fallen Partisans in Piazza Maggiore, Bologna. He saw it as a continuation of Mirages, heavy but more melodic, and said the album is really a story of waking up while resisting an interpretive narrative. The four-part Harmony in Blue suite moves from a warmer tone to a much darker one.

PopMatters' Nate Dorr gave it 8 out of 10, Tiny Mix Tapes four out of five, and Treble's Michael Henning called it a dense record saturated with several layers of texture. Pitchfork's Mark Richardson called it sensual body music of a very particular kind, and Pitchfork later ranked it ninth in its list of the best ambient albums. Stereogum's 2016 ranking put it second of ten Hecker albums.