"The Recognition of Faces," by Leon Harmon (Scientific American, November 1973) was the first published work on photomosaic concepts.
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Harmon was a Bell Labs researcher who had been developing this concept, and the first image in this article was the well recognized portrait of Abraham Lincoln from the U.S. five dollar bill made from a collection of solid gray mosaics.
Abraham Lincoln | Lincoln | Lincoln, Nebraska | Lincoln's Inn | Lincoln Memorial | Lincoln Cathedral | Lincoln Center for the Performing Arts | Lincoln City F.C. | Lincoln City | Lincoln's Inn Fields | Bishop of Lincoln | Lincoln Park | Lincoln, England | Lincoln County | Lincoln Ellsworth | Lincoln Park, Chicago | Lincoln Laboratory | Lincoln Highway | Lincoln (2012 film) | President Lincoln | Lincoln University | Lincoln Continental | Lincoln College | University of Nebraska–Lincoln | Lincoln Steffens | Lincoln College, Oxford | Andrew Lincoln | Lincoln Heights | Lincoln County, Nevada | Jazz at Lincoln Center |