● Design concept: Dajiaolou is located at the commanding height on the east side of Mutianyu Guandong, and is now named Mu Zi One. It is one of the famous landscapes of Mutianyu Great Wall. Historically, it was the dividing line between the Great Wall of Jizhen and the Great Wall of Changzhen. To the east is under the jurisdiction of Jizhen, and to the west is under the jurisdiction of Changzhen. The necklace is a 3D combination of a circle and a simplified version of the big corner tower, which is applied to the ancient philosophy of "the sky is round and the place.