PURPOSE: To understandably and easily composite a relativistic image by radiating light with a finite speed and determining its path.

CONSTITUTION: Light with a finite speed is radiated to determine its path. Namely, processes of separating a light beam, converting it depending on prescribed environment and approximately determining the environment are included. At shown by each figure representing a lattice within the space-time by ray-tracing algorithm, lattice image is clearly contracted by the effect of shrinking of a length in the moving direction by Lorentz and Fitzgerald and a lens effect is generated because of the finiteness of the time of flight. Thereby a relativistic visual effect which is difficult to understand by intuition can be represented in understandable manner.