Yesterday was Veteran's Day, the U.S. holiday where we Yanks honor the members of our military, past and present (and get our annual Band of Brothers fix on TV). The timing of the holiday is based on Armistice Day's 11-11-11—that's the 11th hour of the 11th day of the 11th month of the year, which in 1918 marked the official cessation of World War I hostilities.
At precisely 11:11 a.m., each year on 11-11, the sun aligns through the elliptical holes in each of the five marble pillars (each representing a branch of the the U.S. military) in order to perfectly illuminate a round mosaic inlaid into the bricks; that of the Great Seal of the United States. The symbolism of the five pillars standing in formation in order to protect the United States and to complete the solar illumination is representative of U.S. military personnel working together in all regards, in the security and defense of American citizens.
The project was designed by Palmer Jones, engineered by Jim Martin Oscar Oliden and Steve Rusch and constructed by the Haydon Building Corporation.