Which literary device is demonstrated by the expression "where the sun is silent"?

Explanation

The phrase "where the sun is silent" combines sensory experiences by attributing silence, a sound-related quality, to the sun, which is visual. This blending of senses is characteristic of synesthesia. Allegory is an extended metaphor, metonymy uses related terms to stand for something, and simile involves comparisons using 'like' or 'as'.