Art 21 refers to itself as the "biennial of television" because a new season of four 1-hour, thematic programs premieres on PBS every two years. One of the most impressive things about this website is the designers' prescience - re-formatting may have been done, but older content appears harmoniously alongside newer material. The fourth and most recent season highlights the themes "Romance", "Protest", "Ecology", and "Paradox". "Protest" examines the ways in which four artists use their work to picture war, express outrage, and empathize with the suffering of others. While "Romance" features artists whose works pose questions about the role of emotion, regret, fantasy, and nostalgia in contemporary art. Back on the homepage, visitors can easily find artists from earlier seasons, such as Barry McGee, featured in Season 1, wondering what young graffiti artists might think of his graffiti-inspired work.