Assertion: preliminary sketch | /r/AtLocation | a layer of its own
Facets:
value: on the wall underneath the fresco
type: LOCATION
Source sentences:
text: With sinopia—the preliminary sketch found on a layer of its own on the wall underneath the fresco, or painting on freshly spread, moist plaster—one reaches the point at which a work that merely served as technical preparation becomes a formal drawing expressing an artistic intention.