Ghost fish is a wandering interpolation of curves that is generated based on a bicycle's motion around an obstacle path.

The skeleton of the fish is generated by trimming the trajectory curve at a given point on the path and for a given length; using this curve section as the spine gives the fish its wavy appearance when it moves.

The spine is divided into five points: front, middle front, apex, middle back, and back.

Three ellipses are drawn at the middle points, and then bent projected on a parabola to give the Fish its dynamic appearance. The length of the fish, width and height of the ellipses, and depth of the parabola are interpolated from speed data and plane angles.