I have to come to the realization that in this world, things that are in union with polar opposites tend to be more in harmony than things that are not.

For example, blue autumn is seemingly more harmonious than yellow autumn or orange autumn. The reason for this is because yellows and oranges are naturally associated with the color of the leaves within autumn. However, the color blue is on the opposite end of the color spectrum of these colors. Therefore, juxtaposing the word blue with autumn creates a more harmonious feel.

Also, in art, it is more harmonious to pair colors on the opposite ends of the color wheel rather than with colors that are right next to each other.