Third-Floor Hallway                                    -      #      - 
(-------------------------------------------------)     # <---(M)---> #
                                                        -      S      -

You are walking down a brightly-lit hallway, with walls made of what
appears to be pure octarine.  The lighting flickers uncertainly, like the
building is suffering from a brownout.  A strange humming sound
reverberates through your bones, and you begin to feel a faint tingle of
unease.  A window opens out onto a stone ledge to the north.