Why do we associate green with poison? What is the psychological subtext of Pablo Picasso’s Blue Period? And was that viral dress back in 2015 actually blue and black, or white and gold? A new podcast from the National Gallery in London discusses these questions and more, using an array of experts—including a “color therapist”—to explore the many fascinating ways in which color intersects with history, science, and culture. —Paulina Prosnitz