That was for mainly 2D image compositing (aka 2D matrices).
If you dig earlier, you'll find SideFX Houdini (successor of PRISM) which isn't tied to a dimension, 1, 2, 3D, geometry. You swing between all these to create whatever you want. It's like interactive math and physics right before your eyes taken to an extreme (at least until 2010s). You can then lift parameters from the graph to "package" it as a user made function to have things like city generations
