How is William Blake's poem "The Tyger" a by-product of the Romantic era and still relevant today?

Though
Blake is often considered part of the Romantic movement, his work is unique and does not wholly
fit in with the trends of his time. Much of his poetry predates Wordsworth and Coleridge but
cannot even be classified as belonging to that transitional period in English poetry between the
classical (or neo-classical) and Romantic eras. Still, "," as a representative poem
from his Songs of Experience, does express themes not inconsistent with the
late eighteenth-century and early nineteenth-century Zeitgeist.

Blake often deals with dichotomies of human thought and feeling. He also tends at
times to use an inverted vocabulary in which words take on the opposite features of their
conventional meaning. That which is characterized in seemingly negative terms is often a
positive symbol for Blake. In his life as well as his work, he was an iconoclast and a rebel,
and this part of his character marks him as typical of the Romantics. The tiger/tyger of his
poem stands for that defiant,...