Hyperbola - Acrobatic Stick

This hyperbola - Acrobatic Stick kit is the set of points in a plane whose distances from two fixed points, called its foci (plural of focus), has a difference that is constant. Hyperbolas can either open left and right or open up and down. The applications of this kit includes the catenery curve, or an important curve in the design of arches; spider webs, hanging cables, skydiving, ocean gravity waves and etc.