Exhibition of the week Turner & Constable: Rivals ...

A sale of Modern British Art earlier this year brimmed with the kind of wonderful works that auctioneers find a little heart-wrenching to let go, including a Waterfall full of wild windiness by Sir Kyffin Williams

The gargantuan, bewildering Louvre

Between a Constable resonating with Nature and a Castiglione blaring with turbulence, a picture by Algernon Newton captured the quietude of absolute stillness

Spanning the 1920s to 1970s, Into Abstraction: Modern British Art and the Landscape, at Firstsite in Colchester, examines the evolution of abstract art during periods of sweeping social and political

Alexander Marshal–this country’s first major botanical painter–deserves to be better known, writes Tiffany Daneff, after seeing his luminous originals in the Royal Collection