 The last of these, "Migrations", embed bird and animal motifs in timeless settings.The extraordinary brushwork and relief effects developed over a life-time of drawing in close association with sculptors, was combined with a new potency of colour and epic scale.Swathes of yellow evoke the deserts of pre-history and post-history, as well as the very immediate issue of the fields of oil seed rape that were appearing in the 1970s.