Which sentence best develops the author's thesis that Louise Nevelson was a celebrated artist who created completely new types of sculptures?

Sculpting a Message
People who know artists say that artists look at the world differently. This saying was true for Louise Nevelson, one of the world's most
celebrated sculptural artists. Until Louise Nevelson's time, sculptures were made primarily of carved stone or poured metal. Louise Nevelson,
however, created completely different types of sculptures. Hers were assembled from ordinary objects.
Artists of the first half of the twentieth century were inventive in their subject matter and technique. It was an exciting time in the art
world. Even among innovators, Nevelson distinguished herself. Instead of cutting stone or pouring metal, she built her art. She deliberately
sought discarded items (she called them "found materials") such as pieces of wood, tin cans, and pieces of items out of trash cans. She
grouped them in varying combinations inside boxes and then stacked the boxes on top of one another. Known as wall sculptures, these
structures were usually painted a single color, most often black.
Sky Cathedral, one of Nevelson's most well-known sculptures, consists of 38 boxes of varying sizes. For the viewer, Nevelson's sculpture
creates a feeling very different from the origins of the materials. Viewers experience a sense of awe and mystery when they see her artwork.
Writers have speculated about the meaning of her work, often seeing the boxes as filled with symbolism. For example, the disarray of objects
inside the boxes is said to represent her past, while the pieces of debris symbolize memories of unknown people or bits of life.