This anniversary won’t be marked by many people, but Disney released a historic film on this day thirty years ago.

The studio’s first fully-cg animated short, Oilspot and Lipstick, debuted on July 28, 1987, at the SIGGRAPH conference, held in Anaheim, California that year. The short, as far as we know, was not released to the general public. (A clip from the short can be viewed below.)

In the animated piece, Oilspot and Lipstick are two small mechanical “junk” dogs who are threatened by a junk monster. The film, directed by Mike Cedeno, had actually been produced a year or two earlier, but released at SIGGRAPH in 1987.