Assertion: art movement's work | /r/CapableOf | feature unconventional materials
Facets:
Source sentences:
text: Throughout the 1960s and 1970s they staged "action" events and produced sculptural works featuring unconventional materials.
text: Throughout the 1960s and 1970s (their most active period) they staged "action" events, engaged in politics and public speaking, and produced sculptural works featuring unconventional materials.