Panel D was different to the others in many ways. It was intended to bring attention to the frame as a device and decorative element in its own right.
Panel D itself was not the focus and it was devoid of colour or surface treatment. Its sole purpose was to draw the viewer’s attention to the frames behind and contained by it. The corners of those frames contained by panel D were exaggerated in their treatment so that they became the artwork, leaving panel D as a form of anti-art.
Panel D was formed by water jet cutting and kiln polishing 6mm float glass, with the intention of producing the least visible solution.