
Judd worked mostly from plexiglass like this, wood, metal, plywood, and concrete.

(He used metal for this one)
Later in his career, he grew more and more dissatisfied with the art world - specifically, the idea of temporary exhibits designed by snobby curators. He created permanent installations that were not meant to represent anything.
In 1986, the Chinati foundation opened a non-profit art center in Marfa, TX, for Judd and his contemporaries, like Dan Flavin and Claes Oldenberg (below). Judd contributed 15 outdoor pieces and 100 aluminum pieces to the permanent collection. Sadly, Judd died in 1994 of lymphoma in Manhattan.
But on a happier note: Color! Material! Light! Minimalism!



And just because these other guys are cool too...

Dan Flavin

Claus Oldenburg