Part 4 of Light & Magic gets into ILM of the 80’s when, by that time, they were turning the crank on analog/optical special effects. There was some burnout within the ranks, along with a feeling that they’d reached the limit of what could be done with cameras and physical objects.
The EditDroid, that I discussed here previously, is credited as the start of the push by George Lucas into digital technology. After that, Photoshop and Pixar were created. (Yes, Photoshop had a Lucas connection.) That’s a DEC VAX 11/780 minicomputer shown at the start of the video.