What is the dharmakaya?

It is a tree I see that grows in the beautiful garden of Zen,
upon mountain, overlooking the valley of ten thousand sunsets?
It is a tree in bloom when apples rust and iron railings blossom under a black moon.
An endless fall of silent green leaves that bury a valley and conceal a mountain.
I swoon and fall in orgasmic glow
For I have a deep passion for the sharp end of the sword.