Marisa Merz, the artist whose mystifying paintings and sculptures became a benchmark for the Arte Povera movement, has died at age 93. Merz, who was born in Turin, Italy, where she was living at the time of her death, was the only woman artist among the Italian Arte Povera artists.

The group was named by critic-curator Germano Celant in the late 1960s, and dubbed as such for its members’ use of “poor” materials, which often included household objects like coffee beans, clothing, copper wire, tin, and other found items. Merz’s husband, Mario Merz, was also a key figure in the movement.