Arriving international passengers of SFO waiting to have their passports checked encounter eleven rectangular columns with cast glass panels mounted on each side. While the cast glass on the front has a smooth finish, the back is cast into a serrated shape. These works of art is called Welcome by artist Su-Chen Hung. Behind the serrated cast glass is a matching acrylic panel featuring vinyl letter text that says “Welcome” in different languages. The serrated layers create an optical illusion that the words disappear as the viewer walks by.