Striking novelty (istiṭrāf) presents a familiar subject through an unexpected comparison, making the listener notice something unusual.
A commonplace scene likened to a rare and intricate phenomenon may be effective not only for the shared trait but also for its imaginative freshness. Novelty still requires a perceptible basis of comparison: unrelated odd words are not eloquence.
The purpose combines a new viewpoint with an intelligible but surprising imaginative link.