<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://hbu.h-cdn.co/assets/cm/15/04/1280x1705/54c0b672e5657_-_05-hbx-ladder-secret-room-maya-0608-s2.jpg>
<http://www.housebeautiful.com/room-decorating/entryway-ideas/tips/g1380/unique-staircases/>