A Peek Into an Artist's Mind Developmental pieces in the archive from concept sketch to blueprint to final coloration pull the curtain back to show how art is made and offers a glimpse into the working mind of an artist. A series of sketches, blueprints and a colorized draft for "The Great Wall of Los Angeles 1950: Forebearers of Civil Rights" panel show the piece's evolution — how Baca went from a tangle of intersecting diagonal lines to a vibrant mural depicting prominent civil rights leaders and activists like Paul Robeson, Rosa Parks, Gwendolyn Brooks, Ralph Bunche and Martin Luther King, Jr. rising from their bus seats and moving forward for new destinations.