This small sake cup (guinomi) features a deep blue-green glaze that naturally flows during firing, creating organic textures similar to mineral patterns or flowing water. The darker glaze gathers near the rim while lighter blue tones appear across the body, producing a layered color effect that changes subtly depending on the light. The rounded body and small foot give the cup a stable, balanced form that sits comfortably in the hand and is well suited for enjoying sake aromas. The base carries a handwritten kiln mark, indicating a studio-made piece rather than factory production. Works of this style are commonly associated with modern Japanese studio pottery from around the 1990s–2010s, where potters focused on natural glaze expression and simple functional forms used in everyday drinking culture.