The bouncy script was broken.  Basically, I didn't understand how he was doing things; I only knew how to translate his bits to Python.  I'm getting closer.  Now I have collisions (albeit slightly hackish ones).  The "soft bodies" aren't working, although cloth is.  Perhaps someone can take a look at it when I post the script, later tonight, and see if they can envision a decent collision loop that could work with the simulator.  The original C code uses while loops three deep, and it has me all mixed up.  Hard to debug that sort of thing, because Poser keeps getting caught in infinite while loops.  Sigh.

Here's another, higher res square, colliding with a cube.  Firefly doesn't like to render smoothing and shadows on these, unfortunately, so no shadows....

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.