How does Marianne Moore use imagery in The Fish?

Moore's poem attests to the fact that although humanity may attempt to shape nature to fit its needs, it is ultimately a futile endeavor. Time itself effaces humanity's attempt to control nature. Moore threads images of the human world, culture, throughout the poem. In almost all cases they are negative images, suggesting the worst that human beings have to offer. In the opening stanza, she refers to the ocean's sand as "ash heaps," creating the sense, ironically, of a landscape decimated by fire. Later, she describes the sun as moving with "spotlight swiftness" as it slices through the water. By comparing the sun to a man-made object (that is, a spotlight), Moore highlights not only the human drive to "know" nature but the intrusive quality of that drive. More violent images of human presence occur in the seventh stanza, where Moore lists "marks of abuse" found on the seaside cliff. These marks include "dynamite grooves, burns, and / hatchet strokes." A human being, however, appears nowhere in the poem, testament to humanity's failure to change nature and to nature's capacity to endure long after human beings have gone.