Winter and Spring Landscape, first half of the 15th Century. Attributed to Tensho Shubun (Japanese). Six-fold screen, ink and slight color on paper; image: 117.4 x 343.5 cm (46 1/4 x 135 1/4 in.); overall: 131.4 x 381.6 cm (51 3/4 x 150 1/4 in.); clo