The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World is a 2021 book of neuroscience, epistemology and metaphysics written by psychiatrist, thinker and former literary scholar Iain McGilchrist. Following on from McGilchrist's 2009 work, The Master and His Emissary: The Divided Brain and the Making of the Western World, The Matter with Things explores the radically different worldviews presented by the two hemispheres of the brain, and the many cognitive and worldly implications of this.