SGI Visualisation Systems... Good for Maya and what else?

I have a small SGI collection (a dozen and counting, including the Onyx2, Origin 2000 rack and rack Onyx 10000) and, to be honest, I mostly collect them because... well, they look cool, and when I was in a position where I couldn't collect (a. New Zealand, b. No space) I drooled over them. I was asked recently what my Onyx rack was good for. And it occurred to me beyond the easy answer of "running Maya"... I wasn't really sure. So, if you used one of these bigger machines in production (particularly the Onyx, Onyx2, etc graphics "Visualisation" systems)... I'd sure love to know what -you- used it for. (Both of my Onyxes came from Boeing, the rack has a rather wicked looking custom built VME card... but I've got no clue what it was really used for) Thanks all; - JP