The front part facing the river is a triangular unit, which is composed with 10 different angles from 60 degrees up to 150 degrees and reflects the scenes of light and city with the total units of more than 80. Contrarily the back surface of commercial area was finished with a flat surface. While the elevation plane toward the river was intended to express the speed of city by wrinkled image, the flat surface located in the western side directly projects the image toward Bojeong-dong café alley.