<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/54eb92108f37a_-_sand-art-in-a-bottle-by-andrew-clemens-lgn.jpg>
<http://www.countryliving.com/life/a5542/crazy-sand-art/>