1. An interactive input system, comprising: a pointer input region; a multi-angle reflecting structure located along a single side of the pointer input region and operable to reflect radiation from a pointer within the pointer input region from at least two surface locations of the multi-angle reflecting structure, wherein the at least two surface locations each have different respective angles; an imaging system operable to capture within at least a portion of the pointer input region images of the reflected radiation located within a field of view of the imaging system; and processing structure for determining the location of the pointer relative to the pointer input region based on the at least one image.