During the 1930s and 1940s in the US, thousands of murals were painted on public buildings as part of President Roosevelt's New Deal programs, which provided work for unemployed artists. These American muralists copied the Renaissance process of making sketches and drawings before transferring the full-scale designs to walls. In medieval Europe, Denmark has the most surviving wall paintings from that era, known as chalk paintings that were applied on a limewash layer. The earliest known mural art dates back to paintings found in 1994 in the Chauvel Cave in France depicting animals in pigments.