Cartoon Dancers Cavort in Klee’s Art Playground at Tate

One day Paul Klee was painting, he told a fellow artist, and he didn’t know why but he had to dance.

Klee also famously described his art as taking a line for a walk. Since the trajectory was rhythmical and intricate, it makes just as much sense to think of him doing a waltz or a fox-trot -- though probably not anything as sensuous as a tango or a twerk -- inside a little picture frame.