Russian Art Museum _Sergei Isupov _ Photo Credit John Polak _Bathing Day__2015_35126_360dpi Sergei Isupov, Bathing Day, 2015, porcelain, slip, glaze, 10 x 12 x 5". Sergei Isupov, Bathing Day, 2015, porcelain, slip, glaze, 10 x 12 x 5″.