I believe the answer is: assemblages
assemblages refers to a form of act that is being done by collecting and gathering several objects into a larger one. This form of art was first popularized by pablo picasso ( in the cubist constructions), and the artis limited only to three dimensional form of visual art.
Explanation:
Chief Joseph was a Nez Perce chief who, faced with settlement by whites of tribal lands in Oregon, led his followers in a dramatic effort to escape to Canada.