David Hockney, “George Lawson and Wayne Sleep”, 1972-75, acrylic paint on canvas. I saw this painting three years ago at the Tate Britain as part of a series of Hockney’s “double portraits”. The austerity of the room is moving. The only furniture is a wooden clavichord and simple stool set against an unadorned wall. Hockney remarked on the difficultly in painting a plain, light bathed wall. The room feels quiet and distant.