Visualisation of text elements where meaning is shown through the layout. No connecting lines in the pure form but they can be used. An analog equivalent could be a pin-board or lots of paper on a table.
“To fuzzily relate two items, they are simply placed near to each other, but maybe not quite as near as to a third object. This allows for so-called “constructive ambiguity” (Shipman and Marshall, 1999b) and is an intuitive way to deal with vague relations and orders.”
Heiko Haller. 2011