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.