This is a secular, first-person account of a contemplative practice developed over more than thirty years of Zen meditation, written by a practitioner rather than a scholar. It draws together Charlotte Joko Beck's teaching on the core negative belief, Iain McGilchrist's account of hemispheric asymmetry, Douglas Hofstadter's notion of the strange loop, and neuroscientific research on the Default Mode Network and interoception, treating these as convergent descriptions of a single territory rather than as a unified theory. Breath and interoceptive attention to the hara are presented as a bridge between narrative self-reference and embodied presence, and the geometry of a cone — differentiation at the rim, unity at the apex, one continuous surface throughout — is offered as an image for how duality and non-duality relate. The guide does not claim to resolve psychological difficulty or master an unruly mind; its aim is the embrace of experience as already complete, including experience shaped by chronic pain, which the author lives with directly. The neuroscience and philosophy of mind serve as an approach road, not a destination — offered for readers who want it, and dispensable for those who don't.