Editing Unisphere (section)

===Base===
[[File:New York World's Fair August 1964.jpeg|thumb|The Unisphere and surrounding areas in 1964]]The Unisphere is centered in a {{convert|310|ft|m|adj=mid|-diameter}} circular reflecting pool, with a floor of poured concrete surrounded by a bulkhead of granite and concrete. Forty-eight pairs of fountainheads, on the outer edge of the pool, are designed to obscure its tripod pedestal.<ref name="NYCL p. 4" /> Prior to the 1990s renovation, there were 48 single fountainheads.<ref name="NYC Parks Unisphere" /> Two pumps in the pool recycle the water that is used in the fountainheads. The effect is meant to obscure the tripod supporting the Unisphere, making the globe appear as if it is floating in space.<ref name="n82194889" /> From the perimeter of the reflecting pool, the Unisphere is meant to depict the Earth as seen from {{convert|4000|mi}} away.<ref>{{harvnb|ps=.|Landmarks Preservation Commission|1995|page=6}}</ref>

The Unisphere is built on a concrete foundation, which includes the piling ring that supported the [[Trylon and Perisphere|Perisphere]] of the [[1939 New York World's Fair|1939 World's Fair]].<ref name="AR 1964" /><ref name="NYCL p. 4" /><ref name="NYC Parks Unisphere" /> The marshy soil of Flushing Meadows needed special consideration during the original 1937 Perisphere construction. The Perisphere, and subsequently the Unisphere, employed a foundation of 528 pressure-[[creosote]]d [[Douglas fir]] piles of {{convert|95|to|100|ft|m}} in length. Before construction of the Unisphere, three piles were tested for structural integrity and all were found to be sound throughout their entire length.<ref>{{cite book|author=American Wood Preservers Institute|author2=American Wood-Preservers' Association|title=Wood Preserving News|publisher=American Wood Preservers Institute.|issue=v. 43–44|year=1965|url=https://books.google.com/books?id=HKDmAAAAMAAJ|access-date=July 27, 2020|page=16|archive-date=January 23, 2023|archive-url=https://web.archive.org/web/20230123222900/https://books.google.com/books?id=HKDmAAAAMAAJ|url-status=live}}</ref> Six hundred additional piles were built specifically for the Unisphere.<ref name="Rogers 2017" />