A synesthetic metaphor is a figure of speech that blends or crosses sensory modalities—describing a sound as “blue,” a scent as “sharp,” or a color as “loud”—to evoke complex, multi-sensory experiences that transcend literal perception; rooted in neurological synesthesia but deployed poetically for imaginative effect, this technique enriches imagery by activating multiple senses simultaneously, creating immersive, dreamlike, or transcendent states, as famously practiced by Baudelaire in “Correspondences” or Arthur Rimbaud in “Voyelles,” where vowels are assigned colors to unlock hidden harmonies of language and sensation.

Metaphor blending sensory modes (e.g., "loud colors," "sweet music"). Creates vivid, unexpected imagery. Common in symbolist, surrealist poetry. Practice cross-sensory description exercises.