Two weeks ago, I did something I've always wanted to do: I went on an all-day SILENT meditation retreat. No talking, no making eye contact, no interaction with any other human being for a little over six hours. Here's how it went. I assembled early one Sunday morning at the Pyle Center along the shores of indigo-blue Lake Mendota in Madison, WI with seven other people to, well, be in silence for the day. We meditated together, we ate together, we colored mandalas with oil pastel crayons …