The revolution continues

A season of exhibitions celebrates the artist and provocateur’s influence a century after one of his paintings sparked fierce debate. By Peter Aspden

The power of sights unseen

Do you have to see a work of art to appreciate it? Robin Blake explores the power of plinths and gallery wall space left empty

Prime mover

Trisha Brown has inspired a generation of choreographers with her meticulous working methods

Junkyard genius

The detritus that Kurt Schwitters transformed into art defies its humble origins