Why should poetry use metaphors instead of direct expression?

Metaphor can make poetry more artistic and give people a spiritual enjoyment, rather than a sensory touch. Therefore, metaphor is particularly important in poetry, which can make people rise from the enjoyment of the senses to the touch of peace of mind.

It can vividly depict the characteristics of things and give poetry a sense of beauty. Metaphor is a common technique in poetry creation. The use of metaphor in poetry is often closely related to the creation of artistic image, artistic conception, artistic style and even artistic effect. Combined with the characteristics of poetry, the function of metaphor in poetry can be summarized as follows: (1) helps to shape the artistic image "ontology" and "metaphor" with similar form and spirit.