A display device for selectively displaying any one of 2D and 3D images with a capacity of displaying the 3D image with the same resolution as that of the 2D image. The shell body receives the tracing ball. The network layer of the recording computer implements a subset of the normal IP module in the network layer. In another embodiment a deployable book holder includes an aperture, and a recess includes an island. 3125 Gbps and to transmit at a transmit data rate in of 10.