Creatures Caves

A few years ago I downloaded this forcefield for Creatures 3/Docking Station. It was this grayish-blue pillar-looking thing with a red cap or light on top, and light would come out of the top when it was activated. It was useful because even though it was a little picky about where it would work, Norns couldn't see anything on the other side, which prevented them from constantly trying to walk into it.

Now I'm looking for the old agents I used to have, and I can't seem to find this one. I have a Selective Force Field, which is also very useful, but my Beowulf hybrids and Boney Grendels can see each other through it and spend all their time trying to reach each other so they can beat each other up!

Anybody know where I can find the "lightpost" forcefield? I don't know who made it or what exactly it's called, but I'm hoping someone will recognize it from the description and know where to find it.