In the Thirties he was awarded the contract to paint a mural in 1938, both the Postmaster and the artist agreed that a painting on canvas wasn't as permanent as a mural painted on the wall. They wanted it to be permanent. The sand and marble plaster was still wet when Hurd painted, going three feet at a time he completed the Spirit of Big Springs mural A.K.A. O Pioneers, making it part of the wall.
The 1915 post office has gone thru many uses, from post office to the public library in 1970 and then in 1992 it became the 118 Judicial District Court. Hurd felt this was his "first and best" mural. (There are three in Dallas at the railroad terminal.
The O Pioneer mural captures pioneers in West Texas, living in a sod house where they are turning the desert into a farmland. Quoting Walt Whitman "O Pioneers, Democracy Rests Finally Upon US, and Our Vision Sweep Through Eternity."