A man strolled around the North Market balancing a cardboard box on his head. His wife walked beside him and their baby was strapped to his front like a tiny tandem skydiver. Shoppers were doing double takes, their faces lighting up as they tracked the moving stage he was creating with each relaxed and alert step. There were bumper stickers on the box: I YOGA and We had our baby at home. His wife caught me staring and winked at me for smiling at her husband’s little hobby.