Inkstone with Knobbed Protrusions

Dark gray inkstone with irregular shape and knobbed protrusions, resembling a rocky or boulder-like appearance. The inkstone has a flat, smooth surface on top. The protrusions vary in size and are positioned around the edges of the inkstone. A larger protrusion on the left side. The background is a plain light grey color. The artist is unknown, but the title is "Inkstone with Knobbed Protrusions".