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Portrait of Jacobus Cornelius Kapteyn, seated in the Monastery at Mount Wilson Observatory. Kapteyn is seated in a wooden Mission-style armchair, with fabric-covered cushions. He is holding a newspaper in his hands and lap. He is wearing a suit, with a collar and cuff links. Behind him are books on book shelves. The Monastery at Mount Wilson was a dormitory for visiting scientists. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.