Reading Kathy Sierra's post on How to be an expert reminds me of my priactising Tai Chi. I do and teach Tai Chi. I am by no mean an expert. Far from it, I learn something new every time I do it or teach it. From a non practitioner's POV, Tai Chi may seems slow and boring. "How long does it take to learn to rise your arms from your sides to the front?" -- Answer -- a very long time. Such a simply movement contains so many details that maybe too subtle to see, but not too subtle to learn and improve. The richness of Tai Chi makes it fun to climb that path to becoming an "expert".