There's been a lot of excitement around voice as an interface. Voice is incredible—it's fast, expressive, and natural. But voice alone is only part of the puzzle. Voice is about the words you say. Conversation is about building ideas. With conversation, you iteratively talk through things, solve problems, and express what you really mean—getting deeper than a single statement could ever reach. My best ideas come as I walk and move through the world. I engage with thoughts through inner dialogue, in conversation with myself. In these moments, I often wish I had another perspective, or a tidbit of information, or a memory of something I’d said before. This is what a conversational interface could unlock—an extension of your own thinking that listens and responds. Building for conversation is hard. It requires a physical layer that's fast, private, and controllable, so you can effortlessly steer where your inner dialogue goes. It also requires a mental layer that helps you express your genuine self: intelligent, emotionally aware, and useful, without an independent identity of its own. Conversation needs new hardware and software. Nothing on the market has the right features, quality, and form for use in daily life. And it needs an entity designed not as a tool or companion, but as an extension of your own thinking. All of this—new hardware, new software, and a new interface—for something simple yet powerful: talking with yourself. When people ask what we’re building at @sandbar, this is it: a self extension to capture thoughts and build ideas.