Is the red you see indeed the very same red that anyone else does? What is the redness of red even like? These sorts of questions are not just amusing, if worn-out, popular philosophical ponderings. Thinkers in the philosophy of perception take such questions as serious windows into the nature of the world and of the mind. Although we are constantly surrounded by colors, the experience of perceiving them – what it is like to see red, for example – remains a mysterious phenomenon. Where are colors: in objects, or in our minds? Could color experiences ever be explainable in terms of raw physical facts? Or is there something about color that goes beyond what science can teach us? John and Ken go full spectrum with Jonathan Cohen from UC San Diego, author of The Red and the Real: An Essay on Color Ontology.