Marvel at this computer graphics demo reel created c.1980 by the company Mathematical Applications Group (MAGI). More specifically, you're seeing the work of the firm's MAGI/SynthaVision group, one of the main outfits that created the CGI for Tron, including the light cycles (clip below)! From Wikipedia:
In 1981, MAGI was hired by Disney to create half of the majority of the 20 minutes of CGI needed for the film Tron. Twenty minutes of CGI animation, in the early 1980s, was extremely gutsy, and so MAGI was a portion of the CGI animation, while other companies were hired to do the other animation shots. Since Synthavision was easy to animate and could create fluid motion and movement, MAGI was assigned with most of Tron's action sequences. These classic scenes include the light cycle sequence and Clu's tank and recognizer pursuit scene. Despite the high quality images that Synthavision was able to create, the CSG solids modeling could not create anything with complex shapes and multiple curves, so simpler objects like the light cycles and tanks were assigned to MAGI. MAGI was given $1.2 million to finance the animation needed for Tron. MAGI needed more R&D and many other engineers who were working in government contacts at MAGI were assigned back into MAGI's "Synthavision" division.
MAGI sped up the process of supplying its work to Disney Studios in Burbank by a transcontinental computer hook-up. Before each scene was finalized in MAGI's lab in Elmsford, New York, it was previewed on a computer monitor at Disney. Corrections could then be made in the scene immediately. Previously, the only way of previewing the scene was to film it, ship it to Burbank, get corrections made, ship it back to Elmsford, and continue this "ping-ponging" until the scene was correct.