<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54ca5e2dc1002_-_fire-pit-02-0812-lgn.jpg>
<http://www.popularmechanics.com/home/how-to-plans/how-to/g119/build-this-masonry-fire-pit/>