I'm creating a similar project in which I am to think of an instrument that has not yet been invented that properly uses and shows a hyperbola and its many functions. I am also to include and find uses for the asymptotes. When given the assignment my first thought was some kind of military shield given the property that a beam of sorts directed at one foci will be reflected to the other. Any ideas built from that or completely new ones for that matter? Any ideas on how to incorporate the functions of the asymptotes?