Walter's Helmet is a bike helmet project. The project seeks to establish mediated information with the minimum of user distraction. As a hands-free interface, the helmet will listen to the audio, imagery, and motion of the environment. The bicyclist can make phone calls or give dictation, or listen to music or other information. The helmet attempts to provide the user with the most information and the least interruptions. It uses a horn, and front, back, and side lighting for visibility and signaling. The helmet is designed to intrude slightly with unusual external information; for example, it will tell you when a car is approaching.