Burj Khalifa with Smith's attempts to make the crown more slender. The building opened on 4 January 2010. The tower was designed by Skidmore, Owings and Merrill (SOM), which also designed the Willis Tower (formerly the Sears Tower) in Chicago and the One World Trade Center in New York City. Burj Khalifa uses the bundled tube design of the Willis Tower, invented by Fazlur Rahman Khan. Due to its tubular system, proportionally only half the amount of steel was used in the construction, compared to the Empire State Building. Khan's contributions to the design of tall buildings have had a profound impact
Formerly Known that Christian hip-hop is not lame." Hill considered "Let There be Light", featuring Lecrae, a personal favorite. Wildes listed "Fools Gold", featuring Sho Baraka and Swoope, and "Michael Jackson", featuring Thi'sl, Rich Perez, R-Swift, and Bubba Watson, as the two songs which he liked the best. "Michael Jackson" sampled a line from Kanye West and was based around the concept of Christians being former sinners who were "bad real bad Michael Jackson". Wildes noted the humorous intent of the appearance of golfer Bubba Watson and stated that it "closes out a fine project". Formerly Known Formerly Known is the second