Donald Judd helped found the minimalist movement in the 1960s. He primarily used box-shaped structures throughout his career and felt that art should exist independently of an artist's personal feelings. In his later years, Judd created large copper and brass structures with smooth features. He helped revolutionize modern sculpture by bringing basic shapes, space, and simple colors into focus. Dan Flavin was interested in fluorescent lights from an early career and felt that the lights and their shadows could stand alone as art forms. To Flavin, the lights created their own forms and he proceeded to make more works exploring how light affects spaces. Minimalism aims to be appreciated simply for what it is rather than an artist's intentions, pushing boundaries on what