Paul Klee at the Hayward

His experience of taking a line 'for a walk' but seeing colour possessing him reveals his virtuosity in the exploration itself. A trained musician, he saw painting as having the freest abstract potential of all. We are shown it here in a multiplicity of fertile thoughts, drawn from a vast case of work. 'A defined today is over and done for' he told his students seventy years ago. See these images and you'll find the dew still on them.