Dia Art Foundation, Richter created a glass sculpture in which seven parallel panes of glass refract light and the world beyond, offering altered visions of the exhibition space; Spiegel I (Mirror I) and Spiegel II (Mirror II), a two-part mirror piece from 1989 that measures 7' tall and 18' feet long, which alters the boundaries of the environment and again changes one's visual experience of the gallery; and Kugel (Sphere), 1992, a stainless steel sphere that acts as a mirror, reflecting the space. Since 2002, the artist has created a series of three dimensional glass constructions, such as 6 Standing Glass Panels (2002/2011). Drawings In 2010, the Drawing Center showed Lines which do not exist, a survey of Richter's drawings from 1966 to 2005, including works made using mechanical intervention such as attaching a pencil to an electric hand drill. It was the first career overview of Richter in the United States since 40 Years of Painting at the Museum of Modern Art in 2002. In a review of Lines which do not exist, R. H. Lossin wrote in The Brooklyn Rail: "Viewed as a personal (and possibly professional) deficiency, Richter's drawing practice consisted of diligently documenting something that didn't work—namely a hand that couldn't draw properly. ...Richter displaces the concept of the artist's hand with hard evidence of his own, wobbly, failed, and very material appendage." Commissions Throughout his career, Richter has mostly declined lucrative licensing deals and private commissions. Measuring 9 by 9 ½ feet and depicting both the Milan Duomo and the square's 19th-century Galleria Vittorio Emanuele II, Domplatz, Mailand (1968) was a commission from Siemens, and it hung in that company's offices in Milan from 1968 to 1998. (In 1998, Sotheby's sold it in London, where it fetched what was then a record price for Richter, $3.6 million). In 1980, Richter and Isa Genzken were commissioned to design the König-Heinrich-Platz underground station in Duisburg; it was only completed in 1992. In 1986, Richter received a commission for two large-scale paintings – Victoria I and Victoria II – from the Victoria insurance company in Düsseldorf. In 1990, along with Sol LeWitt and Oswald Mathias Ungers, he created works for the Bayerische Hypotheken- und Wechselbank in Düsseldorf. In 1998, he installed a wall piece based on the colours of Germany's flag in the rebuilt Reichstag in Berlin. In 2012 he was asked to design the first page of