About: http://webisa.webdatacommons.org/395686933

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	This technique uses different patterns of black dots, or other shapes such as crosses, to create various shades of grey, used to show light or dark areas, or to differentiate between textures.
http://www.w3.org/ns/prov#wasQuotedFrom	tutsplus.com