Novelists can convey there personal opinions through the main character that can representing themselves.
If you mean dispersion it mean splitting light into 7 parts.
They are used to create artificial rainbow effects
The best answer for this question would be:
oppression of women
The story does not revolve around the oppression of women
but instead it centers on how people have connections with another person and
how they are interacting with their environment addings tensions of human
emotions.