[4] Diaz produces graphite-on-paper drawings, wall relief sculptures, and installations primarily in monochromatic all-white.
[8] Speaking of her tape drawings and white-on-white pieces, Castrillo Diaz has said, “My interest is in quiet, in simplicity, and in the kind of space that is in the periphery and is not quite there, or you don’t know whether it’s there or not.
[4] In 2009, the San Francisco Museum of Modern Art commissioned Diaz to create a mural, Untitled (162 in.
[9] Thinking about how the viewer's perception of the piece changes as he or she walks across the bridge, Castrillo Diaz also felt “it needed to flow like water.
Castrillo Diaz has said that when the distinctions disappear, the piece “comes to completion in a way.”[9] Castrillo-Diaz' work is in public and private collections, including the Whitney Museum of American Art,[11] New York, NY; San Francisco Museum of Modern Art, San Francisco, CA;[12] University of California,[13] San Francisco, CA; and Mills College Art Museum, Oakland, CA.