Palace of Mirrors is the fourth and final full-length album by Estradasphere. It was released on September 19, 2006. The album is composed entirely of instrumental tracks.
The album also signifies a significant change in the band's lineup, with the departure of saxophonist and vocalist John Whooley. This departure is reflected in the album's sound de-emphasis of horns (only being a part of orchestral backing played by session musicians) and vocals.