Final answer:
Anaphora is the poetic style device used in the highlighted portion of William Blake's 'The Tyger,' evident in the repetition of 'What' at the beginning of the lines.
Step-by-step explanation:
The poetic style device represented in the highlighted portion of 'The Tyger' by William Blake is an example of anaphora. Anaphora is a rhetorical device where the same word or phrase is repeated at the beginning of multiple clauses or sentences. In this case, the repetition of 'What' at the beginning of the questions creates a rhythmic and thematic unity in the stanza, emphasizing the inquisitive and profound tone of the poem as it questions the creation of the tiger.
Anaphora often works in conjunction with other literary devices to add depth and emotion to the poetry. In Blake's 'The Tyger,' alongside anaphora, there are also examples of vivid imagery and rhetorical questioning which compel the reader to ponder the nature of creation and duality represented by the tiger and the lamb. These devices are interdependent, contributing to the overall effectiveness of the poem.