"Chapel Window" by John La Farge demonstrates the artist's masterful use of watercolor and gouache to capture the luminous quality of stained glass through a delicate layering of translucent and opaque pigments over graphite underdrawing. The composition's architectural framing lines, rendered in black ink, establish a structured compositional grid that echoes the leading patterns found in actual chapel windows. La Farge's technique reflects his pioneering role in American stained glass design and his sophisticated understanding of how light interacts with colored glass, translating these optical effects onto the two dimensional surface of paper.