It doesn’t take a genius to figure out that Balenciaga’s spring collection was inspired by science fiction. The Tron handbag, part of a group of futuristic duds and accessories, is sharp and slick. It’s a look that’s definitely not for the timid: this hard-bodied bag is not only a tribute to the cult film of the same name, it’s also a fashion-forward style worlds apart from the softer, romantic looks that dominated recent seasons. The bag’s edges are so acute, ...