<https://johnthieringart.com/sand-art/screen-shot-2019-11-22-at-5-55-08-pm/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://johnthieringart.com/sand-art/screen-shot-2019-11-22-at-5-55-08-pm/>