1. A touch screen system comprising: a reflective display surface; a camera mounted so as to capture an image of (i) said reflective display surface, (ii) a pointer approaching said reflective display surface, and (iii) a reflection of the pointer on said reflective display surface; and a processor coupled with said camera that determines a three-dimensional location of the pointer relative to said reflective display surface, based on the positions of the pointer and the reflection of the pointer in the image captured by said camera.