Watching the 28-minute, 10-screen film/art installation, “Lessons of the Hour,” by British artist/filmmaker Sir Issac Julien, is not as overwhelming as one might think. In fact, the flood of images, sounds and words, dedicated to the life of writer, orator, philosopher and social justice activist Fredrick Douglass (1818-1895), a former slave, allows the viewer to absorb and interpret the immersive experience in their own way.