A tetralogy of works by Icelandic composer Anna Thorvaldsdottir that together form a unified structure, written for viola, cello, harp, piano, percussion & electronics. The four main movements are titled Luminance, Serenity, Existence and Remembrance, and are connected by transitions to form a seamless flow throughout the work. The work also has a Prologue and an Epilogue. The work streams from one movement to the next through a flowing texture of sound materials and harmonies.