The Lunder Conservation Center, which opened in July 2000,[59] is the first art conservation facility that allows the public permanent behind-the-scenes views of preservation work.[59] Conservation staff are visible to the public through floor-to-ceiling glass walls that allow visitors to see firsthand all the techniques which conservators use to examine, treat, and preserve artworks.[60][59][61] The Lunder Center has five conservation laboratories and studios equipped to treat paintings, prints, drawings, photographs, sculptures, folk art objects, contemporary crafts, decorative arts, and frames.[60][59] The Center uses various specialized and esoteric tools, such as hygrothermographs, to maintain optimal temperature and humidity to preserve works of art.