  The landmark paper "Constructing tight fusion frames" by Casazza, Fickus,
Mixon, Wang and Zhou introduced a fundamental method for constructing unit norm
tight frames, which they called Spectral Tetris. This was a significant
advancement for finite frame theory - especially constructions of finite
frames. This paper then generated a vast amount of literature as Spectral
Tetris was steadily developed, refined, and generalized until today we have a
complete picture of what are the broad applications as well as the limitations
of Spectral Tetris. In this paper, we will put this vast body of literature
into a coherent theory.
