The glaze is applied in a swirling pattern, creating a unique color and design that's hard to describe. The actual color is somewhere between the second and last photos. I picked it up at an antique market in Ueno without thinking and ended up buying it. It's a relatively thin teacup. I can't find the artist's name, but I imagine they were quite skilled. The diameter is about 12cm, and the height is about 5.5cm.