The affinities with traditional media don't end there.

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But studies of the DNA of farmers living in Europe some 5, 000 to 8, 000 years ago often show affinities with modern-day peoples in the Near East and Turkey, while appearing different from earlier hunter-gatherer populations.

WSJ: Migrations Spurred Agriculture Spread, Studies Indicate

Individual decision makers with special interests and affinities can find and connect online with others who have the same experiences.

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While they are hung separately in the exhibition, the catalog wonderfully juxtaposes Rothko's figurative "Untitled (Man and Two Women in a Pastoral Setting)" (c. 1940) and Milton Avery's "Girl With Cello" (1958) to reveal yet other affinities that Rothko shared with his fellow artists.

WSJ: Becoming Mark Rothko | The Decisive Decade | Columbus Museum of Art

Another U.S. group with known affinities to the FMLN is CASA de Maryland, an immigration-rights group.

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Lowry belongs to the powerful tradition of northern European expressionism and, among his many affinities, Spencer compares with the great Mexican muralists such as Diego Rivera: fittingly, the travelling Spencer show has also been in Mexico city.

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