Both "green language" and the "language of the Birds" refer to the oblique writing styles used by alchemists, magicians, and other mystical initiates to communicate with one another publicly while 'concealing' the information from the hostile or unworthy.

In short, it is a method of symbolic writing which appears opaque or unintelligible unless one has the necessary understanding of its symbolism to interpret it.

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The Tree of Life is an important symbol in nearly every culture. With its branches reaching into the sky, and roots deep in the earth, it dwells in three worlds- a link between heaven, the earth, and the underworld, uniting above and below. It is both a feminine symbol, bearing sustenance, and a masculine, visibly phallic symbol- another union.

In Jewish and Christian mythology, a tree sits at the center of both the Heavenly and Earthly Edens. The Norse cosmic World Ash, Ygdrassil, has its roots in the underworld while its branches support the abode of the Gods. The Egyptian's Holy Sycamore stood on the threshold of life and death, connecting the worlds. To the Mayas, it is Yaxche, whose branches support the heavens.

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