Now this is a really old technique brought way into the 21st century. In the 1800s, photographers travelled the world creating ‘stereograms,’ pairs of photos mounted on card-stock which appeared three-dimensional when observed through a special viewer. These cards and viewers are quite collectible, and some photographers (like my brother) are enjoying the ease that digital photography provides the steroscopic process. But this guy takes it a step further. No printing required here – just mount your iPod Photos as shown in his diagram, and voila!