Abstract: Disclosed is a position detection system for determining a state of a physical object. The position detection system includes a platform and a physical object positioned adjacent to the platform. The physical object has an object state that is changeable. The position detection system also includes a first resonator having a first resonator position state. The first resonator is arranged such that a change in the object state causes a change in the first resonator position state and such that the first resonator position state is different from the object state. The first resonator is further arranged to output a resonator signal that is associated with the first resonator position state when an excitation signal with a predetermined frequency range is received by the first resonator.

Abstract: A computer input system and method is described which includes a spatial reference member having a body with a first surface and an opposing second surface. The spatial reference member separates a first spatial region including the first surface from a second spatial region including the second surface. A physical object is movable within the first spatial region. Optical indicia tracks the physical object through the body. The optical indicia is observable from the second spatial region. An optical detector positioned in the second spatial region tracks the optical indicia and develops signals which may serve as inputs to a computer. The object may emit a signal which is tracked by the optical detector.

Abstract: A computer input system and method is described which includes a spatial reference member having a body with a first surface and an opposing second surface. The spatial reference member separates a first spatial region including the first surface from a second spatial region including the second surface. A physical object is movable within the first spatial region. Optical indicia tracks the physical object through the body. The optical indicia is observable from the second spatial region. An optical detector positioned in the second spatial region tracks the optical indicia and develops signals which may serve as inputs to a computer. The object may emit a signal which is tracked by the optical detector.