More and more I excluded from my paintings all curved lines, until finally my compositions consisted only of vertical and horizontal lines.
Agnes Martin, 1967

In the early 1960s, Martin’s geometric compositions evolved into what would later be seen as her signature style: the square grid. This room represents this important moment in her career by displaying three key paintings which explore the aesthetic of the grid in different colours and forms: The Islands 1961, Friendship 1963 and A Grey Stone 1963. Similar in size, the grids are made from lines intersecting at right angles, creating rectangular divisions within the square format. Referring to these paintings, the critic Lucy Lippard described them as ‘legendary examples of an unrepetitive use of a repetitive medium’.