%A Kell Cheng %X Stereoscopic vision is a well-established phenomenon: biological evolution showed its utility in ancient times. In this workshop, we have examined some subtleties and limitations in applying this old concept to an entirely new application: with modern technology, we attempt to track the position of an early segment of a flying object, and then extrapolate its later trajectory. %L miis166 %T The Tennis Ball Problem %D 2000