BOULDER • At 91, A.K. Best sometimes thinks back to the things his dad said. “Wherever you are, whatever you’re doing, pay attention,” the man used to say back in Depression-era Iowa, where he farmed ...

Mark Barsocchini sees knots everywhere he goes. In the scarf draped around somebody’s neck, or the shoelaces we tie every day. He’s entranced by something most of us take for granted. “There’s a lot ...