The Memorial is replete with symbolic elements. The 36 columns represent the states of the Union at the time of Lincoln's death; the 48 stone festoons above the columns represent the 48 states in 1922. Inside, each inscription is surmounted by a mural by Jules Guerin portraying principles seen as evident in Lincoln's life: Freedom, Liberty, Morality, Justice, and the Law on the south wall; Unity, Fraternity, and Charity on the north. Cypress trees, representing Eternity, are in the murals' backgrounds. The murals' paint incorporated kerosene and wax to protect the exposed artwork from fluctuations in temperature and moisture.