In writing an essay about the influence of art on society, Sam has structured his content by first discussing historical examples of art that sparked social change, followed by a section on contemporary art movements that strive for similar impact.
He includes personal anecdotes and quotes from prominent artists. However, Sam is unsure if the transition from the historical context to contemporary examples flows well. Which of the following sentences, if added at the beginning of the contemporary section, would best facilitate the organization of his essay?