The names we give our technologies are often ... aspirational. Automobiles can move on their own—meaning without horses—but they still can't steer themselves reliably. Visiting via telepresence is nothing like being there. Smartphones have very low IQs. Augmented reality (AR) has been in this same hopeful category since the term was coined in the early 1990s. It was meant to describe screen-mediated experiences that add information to one's surroundings rather than replacing those surroundings, as virtual reality does. The problem turns out to be very hard to solve.