"Tree" by Australian Aboriginal poet Kevin Gilbert, expresses an environmental or nature spirituality in which unity and wholeness accompany the understanding that we are one with such elements of nature as a tree. Gilbert uses personification to emphasize this unity: the tree and the clay address the reader with the "I" pronoun as if they are people. This stresses how much we are interconnected with nature.
The poem also expresses unity and wholeness through enjambment, which is when a thought doesn't stop at the end of the line. For example, the speaking personified voice of the tree addressing humans says "you are nothing" and breaks for a new line. Stopping here on the word "nothing" creates a sense of alienation, threat, and anxiety, as if nature is humankind's enemy, sneering at us—until the continuation of the thought in the next line is revealed: "but through me the tree." We are relieved: our unity and interconnectedness with the tree gives us life and sustenance.
The technique of repetition in the "ands" in the following line also reinforces the ideas of unity and wholeness. We humans are part of a larger spirituality:
earth and God and man
until they fuse
Through personification, enjambment, and repetition, Gilbert supports his theme.