Read the excerpt from "On Imagination” by Phillis Wheatley. Now here, now there, the roving Fancy flies, Till some lov'd object strikes her wand'ring eyes, Whose silken fetters all the senses bind, And soft captivity involves the mind. Imagination! who can sing thy force? Or who describe the swiftness of thy course? How does the poet’s use of rhyme scheme in the excerpt contribute to the tone?