I remember it being a Java applet with animations, but my memory could be terribly faulty at this point.

Following your comments and trying to trail things out, the only thing I can find is a reference to AltaVista LiveTopics.

https://dannysullivan.com/why-search-sucks-you-wont-fix-it-t...

I suspect what I used was that "GRAPH" button in the AltaVista Refine picture.

We might want to archive that image. It seems like the only evidence that this stuff ever existed.