1. An apparatus for allowing the viewing of three-dimensional images using a display device displaying two-dimensional images, the apparatus comprising: a blocking grid positioned between the display of the display device and a viewer; and a drive system for oscillating the blocking grid in accordance with the display of a plurality of images, wherein each image is approximately aligned with the grid and each image is structured such that each eye of the viewer sees only a displayed portion of a displayed image intended for that eye, thereby creating a three-dimensional effect.