All three of these books were greatly influential novels and are considered classics of the feminist speculative fiction and science fiction genre from the time.
The themes of the books vary greatly, but by the end of each book an idea was challenged. The design of each book includes a traditional cover that is underneath a second vellum cover. The vellum cover features a design that, on each book respectively, represents an aspect or theme of the book at the start. When the vellum cover is turned, the interior cover becomes more visible showing how the same theme was addressed at the conclusion of the novel.