I had heard about this long ago, and had forgotten about it.

I found this page[0] that has some examples. Apparently, ATT has a youtube channel with way more interesting content than I would have knee jerk expected with some specific examples[1]

[0] https://content-animation.org.uk/animation_systems/beflix.ht...

[1] https://www.youtube.com/watch?v=_Lmi6cmrq0w