 Van Ingen was also known for his abilities in mural painting, particularly for the work he did for the Library of Congress in Washington, D.C., the U.S. Mint in Philadelphia, the Federal Building in Indianapolis, Indiana and the Panama Canal Authority.Of the murals, Van Ingen said, "I tried to compose into one picture the views to be seen from different standpoints, but united in the mind.It enabled me to combine different periods of time in the construction work."