Last Saturday we began our Tai Chi class, as we often do, with eight Chi Kung breathing exercises. Usually this is the time when a number of people straggle into class before we start practicing the Tai Chi form for the day. Yesterday was different, though. On the eighth exercise I became aware of a rich, peaceful silence. I wish there had been some way of preserving it so that I could bring it out to experience again on some future day when life got too stressful.