Color Theory

Yellow is love and law like the Sun. The sun shines on all equally and is simple. 

Green is goodness and reason like a flower. A flower is symmetrical, has a season, and opens.

Blue is Beauty and Being like the sky. The sky has both day and night, spans all seasons, and symmetrically surrounds the Earth.

Purple is Freedom and Spirit like a tree. A tree is not symmetrical but does stand all seasons.