What does purple refer to in Emily Dickinson's poem "Purple -- is fashionable twice--"? What does purple symbolize in this poem?

Purple--is
fashionable twice--

This season of the
year

And when a soul perceives
itself

To be an
Emperor

In this very brief
poem of Emily Dickinson, the color purple certainly offers a sense of spirituality. A
secondary color composed of red and blue, purple is symbolic of stimulation (red) and
calm (blue) and is often associated with pure thought. The dichotomy of the
symbolic color purple connects these thoughts with a consciousness of the infinite in
spiritual understanding. Miss Dickinson's reflection that purple is in style for the
season leads her to consider that this color, symbolic of spiritual depth, connects the
soul to nature as well as to its royal qualities of spiritual perfection when it reaches
heaven.  Emily Dickinson records the impressions of experiences upon her soul, and the
experience of this poem is felt as purple with all its mystic and royal
qualities.