Hal Prince said: "Follies examines obsessive behavior, neurosis and self-indulgence more microscopically than anything I know of."  Bernadette Peters quoted Sondheim on the character of "Sally": "He said early on that [Sally] is off balance, to put it mildly. He thinks she’s very neurotic, and she is very neurotic, so he said to me, 'Congratulations. She’s crazy.'"  Martin Gottfried wrote: "The concept behind 'Follies' is theater nostalgia, representing the rose-colored glasses through which we face the fact of age ... the show is conceived in ghostliness. At its very start, ghosts of Follies showgirls stalk the stage, mythic giants in winged, feathered, black and white opulence. Similarly, ghosts of Twenties shows slip through the evening as the characters try desperately to regain their youth through re-creations of their performances and inane theater sentiments of their past."