Quadrangular vase in the shape of a Neolithic cong

Quadrangular vase in the shape of a Neolithic cong by Lu Yan. The vase is a gray-green color. It has a cylindrical mouth. The body is square shaped. The sides have raised rectangular patterns. The background is gray and transitions from dark at the top to light at the bottom. The vase casts a shadow to the right. It is positioned at an angle. The base of the vase is visible. The vase appears to have a glazed finish.