Walter Leedy wanted one last look at his old East Cleveland high school before the century-old building was demolished. Leedy was with other Shaw High School alumni last weekend at the building when he suddenly remembered a Depression-era mural. Leedy, an art professor at Cleveland State University, looked around but couldn't find the seven-foot- by 12-foot mural that depicted scenes of student life. He eventually found a basement cafeteria where he thought the mural might be and he and some friends used a chair to smash through drywall. The mural was behind the false wall. The mural is one of thousands created as part of the Works Progress Administration, formed in 19-35 to create jobs. The school district plans to apply for grants to restore the mural and hang it in the new high school.