Tasked, along with other architects, with designing a structure that would both pay homage to the fallen World Trade Center and assuage security concerns for shaken New Yorkers, Ken Lewis describes how One WTC features safety mechanisms that respond to direct threats brought on by the attacks 20 years ago. "In the way that the memorial is the void...this is positive right, the element in the skyline that you see marks that place, as well as being a place of innovation and new thinking and modern ideas of safety and security," Lewis says. IMAGES AND SOUNDBITES