ART21 is an award-winning series of 24 programmes in which 100 contemporary artists talk about their creations, the way they work & their individual view of art. How do artists respond to a world in flux? In what ways do artists act as agents of change, & what kinds of aesthetic choices do they make? Chinese artist Ai Weiwei, American photographer Catherine Opie & Ghanaian sculptor El Anatsui bear witness, through their work, to transformation – cultural, material & aesthetic – & actively engage communities as collaborators & subjects.