For those who don't already know it, I recommend Edwin A. Abbott's 1884 classic on dimensionality and Victorian social satire to spice up our discussion on 1st and 3rd person representations.  It's a quick and a fun read, and you'll never be the same again.  The text is available in several places and formats. My favorite is:

http://downlode.org/Etext/flatland/

You can also read background to the book and the author (and his biting satire) and a matematical postlog at:

http://www.mathaware.org/mam/00/master/people/abbott/index.html