Read the excerpt from H. G. Wells's The War of the Worlds . But, looking, I presently saw something stirring within the shadow: greyish billowy movements, one above another, and then two luminous disks—like eyes. Then something resembling a little grey snake, about the thickness of a walking stick, coiled up out of the writhing middle, and wriggled in the air towards me—and then another. How does the author create an aesthetic impact in the excerpt?