Musical stone

Musical stone by Katsushika Hokusai. Gray stone object with rounded triangular shape. The object is made of a single piece of stone with two rounded protrusions on either side. The stone is dark gray in color. The surface features a geometric pattern of raised dots and lines. There are three circular designs on the stone. Each circle features horizontal lines and a wavy bottom. The outer edge of the stone features a repeating pattern of curved lines and shapes. The background is light gray. The object is positioned with the protrusions pointing downwards.