In many of Emily Dickinson's poems there is the symbolism of the color puple as a mystic and often sensuous representation of thought. With respect to her poem "Heaven--is what I cannot reach!" there is a sense of the majesty of paradise with "Her teasing Purples" as well as a sense of something formidable breathing through this grandeur.
Like purple which embodies a delicate dichotomy of red and blue, the attainment of heaven seems possible, but can be upset if the "teasing purple" changes its undertones. For, while happiness and paradise seem possible--"credulous"--they can also be unattainable as it is only the believable "decoy" that lures one. For, "the Conjuror," Heaven, spurns us instead.
A color that is often well-liked by very creative or eccentric types, purple is indeed the perfect color for Emily Dickinson's very spiritual and mystic poem. With a wonderful, extraordinarily intense message, the color purple represents well the metaphor of the connection between the consciousness with the spiritual as well as the formidableness of such an experience.