As firm and steady as the Earth God, a horizontal bar lies near the bottom of the big wall while a central part of the bar breaks away and moves upward to form a square symbolizing the earth . The square , hung in the middle of the big wall , periodically ejects plumes of mist from its sides to assume the pattern of a rectangle but little by little the pattern transforms and wafts to the air. A fascinating atmosphere is created particularly during the evening thanks to the water mist and background lighting. Etched on steel plate sat tached to the big wall are coordinates, orientation and lengths of base sides of the pyramid to convey with figures the solid foundation constructed with human efforts.