Sixties industrial artist Dan Flavin's last finished work was also Houston icon Dominique de Menil's final commission for the Menil Collection. The installation of Flavin's signature fluorescent light fixtures was designed specifically for Richmond Hall -- an alternative exhibition annex built as Weingarten's grocery store in 1930 and later renovated by the Menil. With an exterior frieze of green fluorescent light, the building -- two blocks south of the museum proper -- won't be hard to find. The interior features two 125-foot-long, parallel walls covered in grids of fluorescent blue, green, pink, yellow and UV light. As the Cy Twombly Gallery and the Rothko Chapel do for their namesakes, Richmond Hall will serve as a long-term home for Flavin's major installation. The Menil Collection exhibits more of Flavin's light fixture work alongside the structures of another industrial artist with "Dan Flavin/Donald Judd: Aspects of Color," through January 24. Both exhibits are open from 11 a.m. to 6 p.m. Wednesday through Sunday. 1500 Richmond Ave., and the Menil Collection, 1515 Sul Ross. For more information call 525-9400 or go to www.menil.org. Free.