Galapagos Finch drawings studied by Darwin.
Several of the drawings are studies for larger paintings and sculptures, some owned by Mr. Logan.
He also created portraits and landscapes and, as would be expected, drawings as studies for his light installations.
Meanwhile, the Asia Society will present an exhibition of Mr. Cai's gunpowder drawings and studies for the project from Tuesday to Dec. 14.
The Orozco pieces here are all preliminary drawings or studies for "The Epic of American Civilization" (1932-34), a large fresco commissioned by Dartmouth College, which Pollock traveled to New Hampshire to see in 1936.
At that point, Ross King writes in his new book, "Leonardo and 'The Last Supper,' " he "had produced only a few scattered paintings, a bizarre-looking music instrument, some ephemeral decorations for masques and festivals and many hundreds of pages of notes and drawings for studies he had not yet published, or for inventions he had not yet built".
Mr. Wayt went on to cite what he called telltale signs that the sketch was not a design study: For starters, drawings are good for studying potential body shapes, but the actual forms must be developed in three dimensions.
Some drawings are preparatory studies for paintings, while others are finished products.
(Also on view are sculptures, drawings, photographs, installations, studies for unrealized projects, and a deluge of documentation).
Mr. Keefe augments "Heaven" with a series of pencil drawings titled "15 Studies for a Radical Building Complex," which have more visual texture than the sculpture itself.
