Richard Weigand says that to fair the curves in his woodworking projects, he looks at the shadows. “Light shows the hard line. If you have a hard shadow, the curve is not properly faired. If it’s properly faired you don’t have black and white, you have a gradient scale of gray. Having both hard lines and faired curves gives you the drama; an artisan has to decide what to leave hard and what to fair. When it’s all properly completed there’s no single reference point, but just one entire piece, a thing that is made of and that makes use of both kinds of effects.