For the next 20 years they showcased modern art with an emphasis on African-Americans, including work by abstract expressionist Norman Lewis, Boston-born Lois Mailou Jones (known for incorporating African images into her work) and lesser-known Washington-area artists.
There will also be exhibitions across the Tate dedicated to the work of abstract artist Kazimir Malevich, Germany's Sigmar Polke and a survey of British Folk Art.
The wall of a jail cell, smeared with excrement as an act of protest, was filmed with such compositional care that it became, in effect, a work of abstract art, allowing us to forget what it actually was: human waste, applied with human rage, and surely unbearable to the human nose.
