Mr. Ciesla was kind enough to show off some of the unusual features of the SGI machines:
The SGI O2 computer has some ports on the side of the case for audio.
As an expensive, high end workstation for critical applications at the time, the O2 is very easy to take apart and service. The whole motherboard assembly slides right out with the pull of a lever (the black semicircle on the left of the module).
The specialized hard drives in the SGI Octane are supposed to have some proprietary brackets to hold them in place, but here a strategically placed towel does the job just fine.
The back of the Octane, showing it's big power supply and room for expansions. It also has quite a few options for video and sound, including SPDIF TOSLINK fiber optic audio, which was a surprise!