"Seeing is believing". "Seeing is the truth". Yet cognitive scientists seem to have uncovered these views as incorrect. Evolution led us to perceive what is best for survival and it turns out this has little to do with what we call 'reality'. Is reality then a creative construct that helps us to live but doesn't reflect the world? Are physical objects a useful hallucination? Or is the very idea of reality perhaps a mistake, and neuroscientists have just got it wrong? Cognitive psychologist and author Donald Hoffman, professor of philosophy and expert on metaphysical relativism Maria Baghramian, and post-realist philosopher Hilary Lawson embark on a radical rethink of reality.