The lower levels of ​​the New World Trade Center has a special curtain wall design. The “flying wing” shaped panels adds more richness to the building facade, and makes the building surface reflect and diffuse in many different directions. The square giant pit in front the building is where the old World Trade Center located. The original building also has a unique facade structural and decorative design in the lower levels. The consice single stone material in the pit adds a sense of solemnity to the site, allowing people to stop and think.