“The lenses have a cut of a certain angle which creates a reflection of light so that it reflects directly. It means that on the outer surface of the tiles, it isn’t necessary to use any other covering,” he said. Most noticeably, the concave lenses create the illusion that they bubble outward. In addition, their reflective surface ensures less light is lost. Much of Line B’s decorative features were damaged during the 2002 floods and had to be replaced.