Martha Levy also contributed to the 1939 World's Fair for her easel artwork, but it would be her mural of the same year, Men Working in Slate Quarry, which would be hung in the Study Hall room of Granville High School that would impact then, and now, the lives of the slate communities nestled about the Valley. In 1939, only twelve slate operators were listed for the New York side of the Valley, a number that remained the same until it finally increased in 1946. 

Martha Levy's three-panel mural may be reflective of a critical industry and of local history, but it very well may also reflect the challenging times. Except for the workers in the actual quarry whose eyes are alert to the incoming carriage, the remaining workers go about their tasks with their eyes cast downward. Their work was very tough, as were the times. 

These ideas were not always visually pretty, as was the focus of the previous era, but they expressed the social realities of the times. For muralists this meant a shift from the use of allegorical paintings to represent a topic to an emphasis on depicting real people in real life.