Danny Lane - "Threshold" (Project Ten Ten Ten) at Mint Museum Uptown

"Threshold" by Danny Lane (American, 1955-), 2010. Stacked plate glass, molded glass, steel.
American-born, London-based artist Danny Lane trained as a painter and explores two- and three-dimensional line in his glass sculptures and furniture. During the 1980s and 1990s, he was internationally known as one of the bad boys of British Design, along with Ron Arad and Tom Dixon. His glass and steel chairs, in which the glass is smashed or stacked, are in museum collections worldwide, including the Mint Museum. Lane's work is modernist in its simplicity and baroque in its love of ornament. His London studio is equipped to create works of considerable scale in glass and steel. Glass furnaces enable Lane's team of skilled technicians to create works of brilliant color. His most recent commission is for a conference table for a major Russian company board room.
Threshold was commissioned by the Mint Museum of Craft + Design to celebrate the opening of the new Mint Museum Uptown at the Levine Center for the Arts in October 2010. It is part of a series of commissions called Project Ten Ten Ten. The work is on the threshold of the craft and design galleries, guiding visitors in. Its 800 stacked sheets of glass undulate in front of colored glass objects made in Lane's studio, as well as pieces of wood. Lane describes it as a sculpture to be experienced: "The viewer activates it. As you walk by, things appear to move. Really, I think the purpose in making art is to make something...that elevates the soul."
Project Ten Ten Ten commission. Museum Purchase with exchange funds from various donors; Gift of William and Patty Gorelick, Drew and Beth Quartapella, Shelton and Carol Gorelick, John and Stacy Sumner Jesso, Richard and Yvonne McCracken, and the Founders' Circle Cause 2009 contributors. 2010.70

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How much is it worth?

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can someone explain how the title "treshold" describes the work