On a recent Saturday, Bill Sherer carefully wrapped fine thread and colorful chenille around a hook. A handful of fly-tying learners watched and copied the move with the materials in their own hands. Sherer has been teaching these classes at his self-proclaimed “throwback, old-fashioned” fly-fishing shop, We Tie It in Boulder Junction, for years. “Here in the Upper Midwest, we have fishing season and we have fly-tying season. It’s a great winter activity,” Sherer said. But for this winter’s