A month ago I spent several hours watching an opening session in the development of the dance piece "Dance is Hard to See," and talking with choreographer Kathryn Tebordo and the dancers about what I had seen and what dance was, or might be, all about. "Dance is the purest form of knowledge" emerged from that conversation, which was a rich experience for me, one I have been mulling ever since. I'm very much looking forward to this coming Sunday's performance of "Dance is Hard to See," to seeing how it has evolved and talking more with Kathryn, the performers, and other audience members about, among other things, what it says about what dance is (see