Photograph of WPA muralist <a href="https://en.wikipedia.org/wiki/Axel_Horn" class="extiw" title="w:Axel Horn">Axel Horn</a> demonstrating "How to Make a Fresco" in the main gallery of the American Art Today Building at the <a href="https://en.wikipedia.org/wiki/1939_New_York_World%27s_Fai" class="extiw" title="w:1939 New York World's Fai">1939 New York World's Fair</a>
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Works Progress Administration, Federal Art Project; Andrew Herman, photographer</div>
<a rel="nofollow" class="external text" href="http://www.aaa.si.edu/collections/images/detail/axel-horr-3002">Archives of American Art, Smithsonian Institution</a>