Please read this before you start: The images in the set A and the set B have been combined in one presentation for convenience. A left mouse click (or a down arrow) will take to the next slide, which is the conventional side-by-side stereo photograph meant to be viewed in two dimensions during the study. (However, these can be viewed by a suitable on-screen stereo- viewer for three dimensional view). On pressing the left mouse button (or down arrow) again, the left image will start flickering. A further left click will present the next slide, and so on. FLICKER STEREO. Rizvi, Raza & Barlas. 2010