A Magically Illuminated Hallway                        -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

As you exhale you can see your breath form a puff of smoke in front of
you.  Come to think of it, there has been a drastic temperature drop.  The
walls have a thin coat of ice accumulating on them as well.  As you go
further south, it seems to get colder.