"Black and White 21" is a work on paper by conceptual artist Jenny Holzer, executed in graphite and watercolor on vellum and presented in the artist's own frame. The piece demonstrates Holzer's characteristic engagement with language and visual abstraction, combining drawing and painting techniques to create a subtle interplay between text and image. Vellum as a support surface adds a translucent, ethereal quality to the work, allowing light to interact with the layered materials in a manner typical of Holzer's exploration of how meaning emerges through material and presentation choices.