Seated meditation establishes and strengthens my convexity – I become present as subject and object combined – the centre of my own unambiguous space. Taiji, on the other hand, with its mysterious principle of single weightedness, develops my concavity – a listening, accommodating presence, always shifting, indeed swarming. It does this by constantly shifting weight from full to empty foot, so that I am never still, never settled. The presence I present is then a mirage – vaporous – changing, shifting. I am effectively in disguise, even to myself.