Assertion: rug's value | /r/HasProperty | discovered in simple rectangular version
Facets:
value: by the upper paleolithic period
type: TEMPORAL
Source sentences:
text: The value of panel subdivisions for controlling patterns had been discovered in a simple rectangular version by the Upper Paleolithic Period (c. 40,000 bc), and panel systems have been a basic form of design since 4000 bc, when pottery painters were already devising varied systems.