They might want to keep an eye on what’s going on behind them.
Swingset at Greenhills, Ohio, ca. 1938, probably by John Vachon for the U.S. Farm Security Administration, via Library of Congress Prints and Photographs Division.
Greenhills, Ohio, was one of three “Greenbelt Towns” built between 1935 and 1938 by the U.S. Resettlement Administration. (The other two are Greenbelt, Maryland, and Greendale, Wisconsin.) There are more Library of Congress photos of Greenhills here.