A plane surface is a flat surface, and any distinct flat surface within a painting or sculpture can be referred to as a plane

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  • Pablo Picasso, 'Head of a Woman' 1924
    Pablo Picasso
    Head of a Woman 1924
    Oil on canvas
    unconfirmed: 345 x 265 mm
    frame: 610 x 510 x 95 mm
    Accepted by H.M. Government in lieu of tax and allocated to the Tate Gallery 1995© Succession Picasso/DACS 2002
  • Jasper Johns, 'Dancers on a Plane' 1980-1
    Jasper Johns
    Dancers on a Plane 1980-1
    Oil on canvas and bronze frame
    support: 2000 x 1619 mm
    frame: 2002 x 1620 x 58 mm
    Purchased 1981© Jasper Johns
  • Dame Barbara Hepworth, 'Ball, Plane and Hole' 1936
    Dame Barbara Hepworth
    Ball, Plane and Hole 1936
    Wood (lignum vitae, mahogany and oak)
    object: 210 x 611 x 305 mm
    Purchased 1982© Bowness, Hepworth Estate

The flat patches seen in cubist paintings are often referred to as planes, and geometric abstract artists refer frequently to planes in discussing their work.