The problem, for a Taiji master, with seated meditation, is its double-weightedness, or rather its lack of single-weightedness, its lack of humour. In Taiji we still sit (sit still), but upon a foot instead of a cushion. And if the leg is relaxed (as relaxed as it can be: that is, elastic) then the leg, simply by being happy, pumps energy into the posture. This energy then expresses itself in the upper body as shapes and moods, urges and playfulness – motion and emotion. This the humour – the light and lightness – of the Natural Process.