Catmull created a system that allowed him to animate 3D models using both
a low-level data description and a high-level scripting language. He also
took advantage of Gouraud shading to make models look more organic.

He was trying to combine together recent advances in both
hidden-surface-removal algorithms and shading with a high-precision scope
to produce animation of half-tone images. In order to do so, he created a
language for data and the operations on that data, and integrated it into
his system.

Key ideas: Humans wont want to key in by hand the many transformations
needed. The making/rendering of a movie is trivial compared to data
acquisition.

Contributions: A complete system for making animated half-tone movies, and
a high-level language for making the process of creating animations
easier.