I find it easier to believe hawk-eye is a system with 10 high speed, high definition cameras, a simple computer using basic maths to plot the 3D position of a shuttle and project the path using more basic maths. This is not rocket science, or maybe a little, it is the same as missile tracking, that is simply locating an object in a space over a number of points in time and extrapolating the point of contact with a constant flat area, the floor. Over time the amount of historical data increases and this helps build better data models, better projections and better conclusions. Whilst line judges get tired, thirsty, fidgety, distracted, more myopic; hawk-eye gets better.