We explore innovative ways to design seamless interfaces between people, digital information, and physical environments. These “tangible bits” give physical form to digital information and computation so that users can directly manipulate information with their hands. We are designing tangible user interfaces that employ physical objects, surfaces, and spaces as tangible embodiments of digital information and computation, exploiting the human senses of touch and kinesthesia. We also explore ambient media as reflections of digital activity at the periphery of human awareness.