HolisticSofa 0.94 was a 1992 Mac screensaver. This quick sample is uploaded for the doggedly curious. It was filmed on my 7600 a while back, and I'm sorry I've no idea where you might find a copy today. But now you know what it looked like.
Quoting the 1993 Macintosh Screensaver FAQ v1.9: "HolisticSofa 0.94 - Alan Keahey -- This module explores the sofa-on-stairs problem detailed in Douglas Adam's 'Dirk Gently's Holistic Detective Agency'. It crashes under the Randomizer on most newer Macs. The author wrote it on a Plus, which it didn't crash on, and can't duplicate the problem. Another Plus owner has reported crashing under Randomizer. [Also available as a standalone screensaver.]"