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A glass floor is a transparent section of a floor, found most often in buildings (usually in the observation decks of towers), or in boats in order to facilitate viewing directly beneath where one is standing.
At 4000 feet (1219 m), the highest glass floor above ground is the novel outdoor application of the Grand Canyon Skywalk, operated by the Hualapai Indian tribe. The highest above ground level in a freestanding structure is in the CN Tower in Toronto, Ontario at 1122 feet (342 m).
Picture gallery 
- Ades, ed. by Dawn (2000). Dalí's optical illusions : [Wadsworth Atheneum Museum of Art, January 21 - March 26, 2000 : Hirshhorn Museum and Sculpture Garden, April 19 - June 18, 2000 ; Scottish National Gallery of Modern Art, July 25 - October 1, 2000]. New Haven CT: Yale Univ. Press. pp. 17–18. ISBN 978-0300081770.
A lot of applications of a glass floor: Glass Floor Heliobus
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