I wrote this Java applet Friday 13 September 1996 hence its name. It uses a very simple algorithm to display the balls, each consisting of the same pre-rendered image. A few days later I wrote a more advanced version, the Cyber Balls animation.
I used the Persistence of Vision Raytracer (POV) to create the 3D image of the ball. Another tool was used to make the image transparent, but I made an error, and a part of the highlight is also transparent. Truly Friday the 13th.