Abstract: A system for auto-stereoscopic presentation of stereo-image pairs that uses volumetric imaging elements so that a viewer may experience a 3-D illusion that appears to be located in a space free of system components. A reflecting optical element produces a real image of part of the auto-stereoscopic imaging system, in a position that is indicative of where a viewer must place their eyes in order to see the 2-D stereo images so that stereopsis may occur, and a 3-D image perceived. A viewer can clearly see where to place there eyes, and without any actual physical elements of the imaging system in, or around, the region where the 3-D image is perceived to be, allowing the viewer to touch the images being observed. Furthermore, in such a system, real objects may be located along side the 3-D images, further enhancing the stereoscopic 3-D illusion by providing additional depth cues.