This work developed at Bell Labs, where Schwartz served as artist in residence.
Employed both conventional and computer based animation techniques.

Knowlton initially hoped the artists would learn the language to program their own movies, but he came to realize that they usually wanted to create something the language could not facilitate, and they also shied away from programming. Therefore he accommodated the artists by, for example, writing special extensions to BEFLIX for Stan Vanderbeek, or creating a completely new language, EXPLOR (EXplicit Patterns, Local Operations and Randomness) for Lillian Schwartz. [1]

[1]: http://translab.burundi.sk/code/vzx/index.htm