Introduction to the purple sand sculpture: The purple sand sculpture "Historical Witness" is 40 meters long. It tells the story of landing sneak attacks, being outnumbered, killing in the south of the city, pushing people into the fire, one rope and twelve, and on the spot that are well known and widely circulated by local people. There are nine stories: buried alive, living assassination practice, mother and child in the cemetery, and corpses in the pond.