What are the underlying themes of the poem "Ten Thousand" by Roo Borson?

The main theme of "Ten Thousand" is Borson's contrarian view of being alive. The
logical conclusion of this contrarian view is that all that is valued or desired is the unknown
future. Borson begins establishing the contrarian perspective in his descriptions of nature: the
birds "dive up"; the "leaves off the ground" become "wheels";
"branches [are] planted against the sky." Things are not as expected. The end result
of this contrarianism is...