This is a simple yet creative 3D-printed model—“Ball in a Box.” A black cubic shell with a circular hole inside cleverly holds a smooth white ball, creating a striking visual contrast. Its straightforward design features strong geometric beauty, making it suitable as a desk ornament, art installation, or teaching aid. The unique hollow design not only enhances its aesthetic appeal but also makes printing and assembly easier. Whether used to decorate a space or spark creative inspiration, this model brings unexpected surprises.