This invention provides a stereoscopic image display system that allows a plurality of experiencing persons to visually recognize stereoscopic images by their naked eyes at one time. The joint can maximize tensile stopping power of the product by mounting a stopper in such a manner as to occupy the maximum area, increase sealing effect and convenience in insertion of the pipe by adopting a packing the most suitable for the joint, and prevent introduction of dust from the outside. Each of the elongated prisms is formed by a top end flat face located at the top end of the elongated prism and having an inclination angle of 1 to 50 degrees, a first prism face located at one side of the flat face, and a second prism face at the other side. 25 inches; applying the binder mixture to a selected surface to form a fiber modified proposed layer; testing the fiber modified proposed layer for fatigue or crack resistant properties; and selecting the binder mixture for application on the existing surface for performance if the fiber modified proposed layer has fatigue or crack resistant properties. Also, the correction means corrects the orientation of the input device such that a directional change before and after the correction is minimized regarding a predetermined axis representing the orientation of the input device. The invention assigns a bus address and virtual identification number to each device and controls communications between the main central processing unit and the devices through a Plug-n-Play protocol.