شِعْرٌ شَاعِرٌ
Poetry described as though it itself were a poet.
A shāʿir (شاعر) is properly the person who composes poetry. Poetry is connected to the act of composing, but it is not the composer. Assigning the agent-quality to the poetry is therefore a striking predicational transfer.
This illustrates an association with the action or its result. It intensifies praise of the poetic work rather than claiming that words on a page are literally a human poet.