The Gates Family Foundation, in celebration of the millennium, commissioned Barbara Grygutis of Tucson to create "Common Ground," a mammoth sculpture, for the recently completed Commons Park. Northeast of the intersection of Little Raven and 15th streets, the park is close to where Denver's first settlers established their camp. The sculpture, completed last fall, is a serpentine stone wall that snakes through the park. Made of Castle Rock rhyolite laid by craftsmen from Brighton's Rock & Company, the piece is meant to suggest a bend in the river, while the path that runs alongside it evokes the trails of the Indians and the pioneers. In some places, the sculpture's contours reflect the mountains to the west; in others, the linear profile of the city. Since the park is only a few years old, it has little in the way of trees, flowers or grass. Unquestionably, the coolest thing about it is "Common Ground."