Red and green IV (1973) is a painting of concentric squares, which slot into place with bold simplicity and are framed with a green edge. The colours Webb uses in this work were inspired by a sunset she saw one evening while walking her dogs. The ‘L’ shapes which make up the grid were created from a series of collages made with black and white paper. In this significant early work, she begins to deconstruct the grid – dismantling, cutting, splicing and layering to create an endless set of configurations. Webb is already exploring the formal elements and processes that she will remain dedicated to throughout her career over the next fifty years.