<P> The sculpture was the result of a design competition . After Kapoor's design was chosen, numerous technological concerns regarding the design's construction and assembly arose, in addition to concerns regarding the sculpture's upkeep and maintenance . Various experts were consulted, some of whom believed the design could not be implemented . Eventually, a feasible method was found, but the sculpture's construction fell behind schedule . It was unveiled in an incomplete form during the Millennium Park grand opening celebration in 2004, before being concealed again while it was completed . Cloud Gate was formally dedicated on May 15, 2006, and has since gained considerable popularity, both domestically and internationally . </P> <Table> <Tr> <Td> Image map of Millennium Park; east is at the top . Each feature or label is linked . </Td> </Tr> </Table> <Tr> <Td> Image map of Millennium Park; east is at the top . Each feature or label is linked . </Td> </Tr> <P> Lying between Lake Michigan to the east and the Loop to the west, Grant Park has been Chicago's front yard since the mid-19th century . Its northwest corner, north of Monroe Street and the Art Institute, east of Michigan Avenue, south of Randolph Street, and west of Columbus Drive, had been Illinois Central rail yards and parking lots until 1997, when it was made available for development by the city as Millennium Park . For 2007, the park was Chicago's second largest tourist attraction, trailing only Navy Pier . </P>

Kapoor's piece is titled cloud gate because