What is the main setting in the novel, Nutshell?

The womb is the most prominent setting throughout the story. The womb is a type of filter through which the narrator makes his observations and inferences. It also seems to be a sort of other world compared to the outside world. In the womb, the narrator is able to ponder the meaning of life and life’s other various mysteries. During the final chapter of the book, the narrator finally breaks Trudy’s water and escapes the womb.