Bill was absolutely unique. A friend for almost half a century, it will be hard to accept his physical absence. But, his laugh, his words, his wildly singular being, in both professional and personal relations, will never be out of sight or sound. To say I will miss him is the most ineffective way to express my feelings. How a human being could extemporaneously make the leaps of penetrating analogies Bill did, is truly beyond explanation. An hour lecture, begun late, would have to end late and then later. There was never enough time for him to get the thoughts completed - before or after the in-person public or private event. Frustration was, unfortunately, often present. But the audience never left without endless new connections and questions. His obsessiveness brought all of us (and himself) emotions we cannot express. How he could contain all of his verbal and visual worlds will forever be a mystery. Speak on, Bill, speak on.