Image superposition and image juxtaposition are common techniques in China's classical poems. Image superposition is actually a special form of image juxtaposition. They came to Europe and America at the beginning of the 20th century, which had a great influence on European and American modernist poets, especially American imagist poets.
It is a term put forward by the American poet Pound by borrowing the skills of China's ancient poems. It means that figurative images are directly connected with decorative images without conjunctions. The difference between juxtaposition images is that the relationship between juxtaposition images of the former is vague or ambiguous, which gives readers sufficient imagination and supplementary space, while the superimposed image of the latter is a metaphor, and its two syntactically isolated images are metaphorical relations.