The tree is one of the most recognizable and important archetypal symbols. It is no wonder many traditions around the world revere the tree as a sacred symbol. 

The design and structure of our lungs seems to mimic the design and structure of the tree and its network of branches that emanate from a central trunk. This correspondence hints at something more than mere coincidence  given that the tree produces the oxygen that our lungs receive. The tree, therefore, is a symbol linked to our act of  breathing and, by extension, a powerful symbol of life itself. Its roots must penetrate deep into the darkness of the earth in order to absorb the necessary nourishment to sustain its growth and expansion towards the light of the sun above. The unseen sustains what is visible, providing us with a metaphor for union and balance between darkness and light, physical and spiritual, and many other apparent polarities and dualities.