This is an anaglyph, a stero image that has to bee seen with the special colored glasses, red on left eye and cyan/blue on the right.
I've been doing some of these as these days with software is very easy to do. Two shots taken by hand with an horizontal separation calculated "intuitively" and processed with software to mix both (the software is
"Stereo photo maker", freeware at
http://stereo.jpn.org/eng/stphmkr/) Some additional processing in PS to fix partially ghosts colors, there are still some but I thought you might like to "explore in depth" :-)