1. A touch detection system comprising: a touch surface; at least one emitter configured to emit radiation in a plane across the touch surface; a reflective material positioned at the periphery of the touch surface and adapted to reflect the radiation toward the at least one emitter; at least one sensor adjacent to the at least one emitter, wherein the at least one sensor is configured to detect an image pattern in the radiation originating from the at least one emitter and reflected by the reflective material; and a processor configured to: receive data from the at least one sensor, and determine a location of at least one object interrupting the radiation based on a change to the image pattern detected by the at least one sensor.