Sustainabity and reuse in design is a poignant topic at the moment and the concept of parasite design presents a new perspective. Instead of replacing an object, why not add a component to existing objects that makes a new whole and gives that object a second life. Not only does this practice raises the question of the lifecycle of objects but also increases the sustainability of them. Guilty design? All depends if you require engineered replacement in your new products or if you design and produce for the long-term.