We end Season 7 not at the end, but at the beginning. The first interface. The one we’ve had all along. The one we are slowly, carelessly, outsourcing. The human body. The original world-modelling apparatus. Our eyes, ears, skin, gut—these are the sensors. Our brain is the wet, slow processor. Our voice and hands are the actuators. This is The Final Interface. The one through which all other interfaces must ultimately be filtered. And it is the one we are trying to replace.Every digital interface is a prosthetic extension of this primal one. A screen is a prosthetic eye. A speaker, a prosthetic mouth. A neural link, a prosthetic thought. But prosthetics can atrophy the limb. As we rely more on clean, digital interfaces to the world model, we risk atrophying our own biological interface—our intuition, our embodied empathy, our sense of presence in a physical, messy world.The season’s lesson is this: we are not just designing interfaces to the model. We are designing interfaces for ourselves. Every UI is a curriculum, teaching us how to think, how to decide, what to value. A slider teaches us that values exist on a spectrum. A button teaches us that actions are binary. A voice interface teaches us that knowledge is conversational.In the finale, we must ask: what is the interface teaching us to become? And is that what we want to be?The final interface isn’t a dashboard. It’s the sum total of all the dashboards, levers, rituals, and mirrors we build. It is the new environment of thought we are constructing for the human mind. We are building our own cage, or our own cathedral, one pixel at a time.So the most critical design specification is not for the machine. It is for the human on the other side. We must design interfaces that make us wiser, kinder, more humble, more curious—not just more efficient. The interface should have a moral effect. If using it makes you feel like a god, it’s a bad interface. If using it makes you feel like a student, a partner, a gardener in a vast and mysterious world, it might be a good one.My final, controversial take for this season is this: The ultimate test of any World Model interface is this: After you turn it off, does the real world seem more, or less, real? Does it seem richer, deeper, and more worthy of your un-augmented attention? Or does it feel like a grey, low-resolution placeholder, waiting for the simulation to boot back up? If it’s the latter, the interface has already won. It has not connected you to a model of the world. It has made the world itself into a model. And you are now just a user, in the loneliest sense of the word. The final interface is the one that, when you walk away from it, disappears completely, leaving you face to face with the terrifying and beautiful thing it could never truly capture: the unsimulated present.This has been the Season 7 finale of The World Model Podcast. The interface is not what we look at. It is what we become. Choose wisely. Goodbye.