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Some friends of mine are avid labyrinth walkers and have recommended the practice to me. But though I’ve long admired the floor of Chartres Cathedral—and once had the pleasure of seeing my children race around it at top speed before they climbed the tower and searched the high vaults for bats—I’ve never been on a formal retreat involving labyrinths. Perhaps that’s because I’m more familiar with informal collapses than with formal retreats. Fortunately an economic alternative has suggested itself: puddle hopping.