Read the excerpt from "The Great Wave: Hokusai."

It is because the sea is blue,
Because Fuji is blue, because the bent blue
Men have white faces, like the snow
On Fuji, like the crest of the wave in the sky the color of their
Boats. It is because the air
Is full of writing, because the wave is still: that nothing
Will harm these frail strangers,
That high over Fuji in an earthcolored sky the fingers
Will not fall; and the blue men
Lean on the sea like snow, and the wave like a mountain leans
Against the sky.

The main subject of the poem is the relationship between
and man.