A man visits the exhibition "Viewpoints: Photographs from the Howard Greenberg Collection" at the Museum of Fine Arts in Boston, Massachusetts, the United States, Aug. 14, 2019. The exhibition, which will last till Dec. 15 this year, presents 150 highlights from the Howard Greenberg Collection of Photographs, a group of 446 images recently acquired by the Museum of Fine Arts in Boston. (Xinhua/Liu Jie)

Photo taken on Aug. 14, 2019 shows the "Well-Dressed Leg" by Lillian Bassman at the exhibition "Viewpoints: Photographs from the Howard Greenberg Collection" at the Museum of Fine Arts in Boston, Massachusetts, the United States. The exhibition, which will last till Dec. 15 this year, presents 150 highlights from the Howard Greenberg Collection of Photographs, a group of 446 images recently acquired by the Museum of Fine Arts in Boston. (Xinhua/Liu Jie)

People visit the exhibition "Viewpoints: Photographs from the Howard Greenberg Collection" at the Museum of Fine Arts in Boston, Massachusetts, the United States, Aug. 14, 2019. The exhibition, which will last till Dec. 15 this year, presents 150 highlights from the Howard Greenberg Collection of Photographs, a group of 446 images recently acquired by the Museum of Fine Arts in Boston. (Xinhua/Liu Jie)

People visit the exhibition "Viewpoints: Photographs from the Howard Greenberg Collection" at the Museum of Fine Arts in Boston, Massachusetts, the United States, Aug. 14, 2019. The exhibition, which will last till Dec. 15 this year, presents 150 highlights from the Howard Greenberg Collection of Photographs, a group of 446 images recently acquired by the Museum of Fine Arts in Boston. (Xinhua/Liu Jie)

A man visits the exhibition "Viewpoints: Photographs from the Howard Greenberg Collection" at the Museum of Fine Arts in Boston, Massachusetts, the United States, Aug. 14, 2019. The exhibition, which will last till Dec. 15 this year, presents 150 highlights from the Howard Greenberg Collection of Photographs, a group of 446 images recently acquired by the Museum of Fine Arts in Boston. (Xinhua/Liu Jie)

People visit the exhibition "Viewpoints: Photographs from the Howard Greenberg Collection" at the Museum of Fine Arts in Boston, Massachusetts, the United States, Aug. 14, 2019. The exhibition, which will last till Dec. 15 this year, presents 150 highlights from the Howard Greenberg Collection of Photographs, a group of 446 images recently acquired by the Museum of Fine Arts in Boston. (Xinhua/Liu Jie)

Photo taken on Aug. 14, 2019 shows the "Conciergerie and the Seine" by Atget at the exhibition "Viewpoints: Photographs from the Howard Greenberg Collection" at the Museum of Fine Arts in Boston, Massachusetts, the United States. The exhibition, which will last till Dec. 15 this year, presents 150 highlights from the Howard Greenberg Collection of Photographs, a group of 446 images recently acquired by the Museum of Fine Arts in Boston. (Xinhua/Liu Jie)

Photo taken on Aug. 14, 2019 shows photographer Dorothea Lange's "Migrant Mother" at the exhibition "Viewpoints: Photographs from the Howard Greenberg Collection" at the Museum of Fine Arts in Boston, Massachusetts, the United States. The exhibition, which will last till Dec. 15 this year, presents 150 highlights from the Howard Greenberg Collection of Photographs, a group of 446 images recently acquired by the Museum of Fine Arts in Boston. (Xinhua/Liu Jie)