Abstract art means many things. It is not as simple as a room full of gestural paintings, almost indistinguishable from one another. It varies beyond the use of linear shapes and pure geometry.
Colour, the painter Patrick Heron once proclaimed, is a continent that artists have yet to explore. The mammoth two-volume The Book of Colour Concepts (Taschen, £150) catalogues numerous attempts ...
A new book spans artists from the 1970s through today around 15 themes, including body art, queer politics, ecofeminism, and the North American diaspora.