Final answer:
Thomas Hardy uses imagery in 'The Darkling Thrush' to create a vivid mental image of the thrush.
Step-by-step explanation:
The lines from Thomas Hardy's poem, 'The Darkling Thrush,' demonstrate his use of imagery as a poetic device. By describing the thrush as 'frail, gaunt, and small' with a 'blast-beruffled plume,' Hardy creates a vivid mental image that helps the reader visualize the bird. This adds depth and sensory appeal to the poem.
Learn more about Use of imagery in poetry