Sue ware pot (Kofun period, 3rd-7th centuries). A Sue ware pot with a short, outward-opening neck and a spherical body.
An ash glaze is applied on top of the whitish high-quality clay, and the contrast between the natural glaze and the ash covering creates the scenery of the vessel.
I filled it with water for about an hour, but there was no water leakage. I think you'll enjoy throwing wild grass.