古来、神仙が住むとされた山中から湧き出る雲を雲気と呼び吉祥を占いました。青海を雲に例え、たなびく雲霞は時の推移を暗示しています。

In ancient Japan, people sometimes studied the shapes of clouds generated atop holy mountains to tell their fortunes.
Seigai-ha represents a blue wind-rippled water surface, as well as the blue sky.
Unka (mist), is a metaphor for the passage of time.