This is the colour of my dreams", said Joan Miro in his painting of 1925, a blob of blue. The colour blue was first produced by the ancient Egyptians in 2200 BC in an effort to create a permanent pigment from lapis lazuli that could be applied to a variety of surfaces. But when the curators of the London exhibition Monochrome No 2 of 2020 started thinking of what they should include, they settled on showing blues from contemporary artists. And there is an interesting balance of American and European artists, abstraction and figuration. There are paintings, photographs - notably cynotypes - and sculptures as well as pieces of writing on the colour blue including an excerpt from Derek Jarman's Chroma: A Book of Colour 1994. Artists included are Jackson Pollock, Robert Rauschenberg, Yves Klein, Dan Flavis, Felix Gonzales-Torres, Ed Ruscha, Roy Lichtenstein, Cy Twobly and Joseph Kosuth. With a vibrant blue hard cover, this is a thing of beauty as well as a thought-provoker. The book is i