Kazuo Shiraga. Difficult Voyage, 1949. Oil on canvas, 35 1/2 x 28 1/8 in. (90.2 x 71.3 cm). Amagasaki City, courtesy Amagasaki Cultural Center © 2015 Shiraga Hisao

Kazuo Shiraga. Work I, 1954. Oil on paper, 43 x 30 1/2 in. (109 x 77.5 cm). Hyōgo Prefectural Museum of Art © 2015 Shiraga Hisao

Kazuo Shiraga. Work II, 1958. Oil on paper, 72 x 95 5/8 in. (183 x 243 cm). Hyōgo Prefectural Museum of Art © 2015 Shiraga Hisao

Kazuo Shiraga. Tenshōsei Botsuusen, 1960. Oil on canvas. 70 7/8 x 108 1/4 in. (180 x 275 cm). The Rachofsky Collection © 2015 Shiraga Hisao

Kazuo Shiraga. Wild Boar Hunting II, 1963. Oil and fur on board. 72 x 80 3/8 in. (183 x 204 cm). Hyōgo Prefectural Museum of Art © 2015 Shiraga Hisao

Kazuo Shiraga. Iroe, 1966 Oil on canvas. 71 7/8 x 107 1/4 in. (182.7 x 272.5 cm). Hyōgo Prefectural Museum of Art © 2015 Shiraga Hisao

Kazuo Shiraga. Daiitokuson, 1973. Oil on canvas. 77 1/8 x 76 3/4 in. (196 x 195 cm). Amagasaki City, courtesy Amagasaki Cultural Center © 2015 Shiraga Hisao

Kazuo Shiraga. Imayō Ranbu, 2000. Oil on canvas. 102 3/8 x 76 5/8 in. (260 x 194.5 cm). Dallas Museum of Art through the DMA/amfAR Benefit Auction Fund and promised gift of The Rachofsky Collection, 2013.21 © 2015 Shiraga Hisao

Sadamasa Motonaga. Treasure, c. 1954. Oil on canvas. 25 5/8 x 31 5/8 in. (65 x 80.2 cm). Private collection, Japan, on loan to Mie Prefectural Art Museum © 2015 Estate of Motonaga Sadamasa

Sadamasa Motonaga. Work No. 1, 1962. Oil, synthetic resin, and gravel on canvas and board. 36 1/4 x 71 5/8 in. (92 x 182 cm). The Rachofsky Collection and the Dallas Museum of Art through the DMA/amfAR Benefit Auction Fund, 2012.2 © 2015 Estate of Motonaga Sadamasa

Sadamasa Motonaga. Work, 1962. Oil and synthetic resin on canvas. 67 3/4 x 90 1/4 in. (172 x 229.3 cm). Hyōgo Prefectural Museum of Art (Yamamura Collection) © 2015 Estate of Motonaga Sadamasa

Sadamasa Motonaga. Work, 1963. Oil and gravel on canvas. 71 5/8 x 53 1/8 in. (182 x 135 cm). The Rachofsky Collection © 2015 Estate of Motonaga Sadamasa

Sadamasa Motonaga. Red and Yellow, 1963. Oil, synthetic resin, and gravel on canvas. 69 5/8 x 108 1/4 in. (177 x 275 cm). Mie Prefectural Art Museum © 2015 Estate of Motonaga Sadamasa

Sadamasa Motonaga. Work 66-1, 1966. Oil and synthetic resin on canvas. 107 7/8 x 167 in. (274 x 424 cm). The National Museum of Modern Art, Tokyo © 2015 Estate of Motonaga Sadamasa

Sadamasa Motonaga. Z Z Z Z Z, 1971. Acrylic on canvas mounted on board. 72 1/4 x 145 5/8 in. (183.5 x 370 cm). The National Museum of Modern Art, Kyoto © 2015 Estate of Motonaga Sadamasa

Sadamasa Motonaga. Piron Piron, 1975. Acrylic on canvas. 108 1/4 x 72 in. (275 x 183 cm). Mie Prefectural Art Museum © 2015 Estate of Motonaga Sadamasa