From the late 1980s and throughout the 1990s Riley reintroduced diagonal forms to her painting in order to disrupt and animate the vertical stripes that had so strongly characterised her immediately preceding works. Known as 'lozenge' compositions, Riley utilised a single visual plane in these works. In the process colour theory, a long standing principle in the artist's work, came to occupy an even more significant part of her methodology. In the present work, as in a large number of oils and gouaches from this period, Riley selected pastel dominated harmonies.