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Lines - Curves
In mathematics, a curve consists of the points through which a continuously moving point passes. This notion captures the intuitive idea of a geometrical one-dimensional object, which furthermore is connected in the sense of having no discontinuities or gaps.
Wikipedia (Nov 9, 2009, "Curves")
In photography it seems somehow more intriguing.
With grateful thanks to the many people and institutions who have provided the examples.
Antiq-Photo, Artcurial, Asociación Manuel Álvarez Bravo AC, Barry Singer Gallery, Bassenge Photography Auctions, Bonhams - London, Carl-Strüwe-Archiv, Charles Isaacs Photographs - Inc, Christie's - New York, Christopher Wahren Fine Photographs, David Moore Estate, Decaneas Archive, Fabien Fryns Fine Arts (CLOSED), Galerie Clara Maria Sels, Galerie Johannes Faber, Galerie Polaris, George Eastman Museum, Gitterman Gallery, Hans P. Kraus - Jr. - Inc., Klotz / Sirmon Gallery, Library of Congress - Prints and Photographs Division, Metropolitan Museum of Art, National Museum of American History - Smithsonian Institution, OMC Gallery for Contemporary Art, PDNB Photographs Do Not Bend Gallery, Phillips de Pury - New York, Private collection of Marco C. Antonetto, Private collection of Margo Jim - Estate of Don Jim, Private collection of Nigel Maister, Provided by the artist - Arthur Tress, Provided by the artist - Burton Pritzker, Provided by the artist - Charles Grogg, Provided by the artist - Jens Knigge, Provided by the artist - John Divola, Provided by the artist - Klavdij Sluban, Provided by the artist - Peter Liepke, Provided by the artist - Werner Schnelle, Scott Nichols Gallery, Silverstein Photography, Sotheby's - Paris, Swann Galleries - New York, U.S. National Library of Medicine - Visible Human Project, Watermark Fine Art Photographs & Books (CLOSED), echtl & Voseček Museum of Photography.