That is impressive !!! How is done and why ?
Yep! :-) The distortion is determined by the relative distances at which the image is captured and viewed. Telephoto distortion can be seen in images shot from a distant using a long focus lens or the more common telephoto sub-type (with an angle of view narrower than a normal lens). Distant objects look approximately the same size – closer objects are abnormally small, and more distant objects are abnormally large, and hence the viewer cannot discern relative distances between distant objects – distances are compressed. Source: wikipedia ;-)