I remember the facility my mother worked at had a family-day and I went on a tour, and got to see an actually operating Cray-2 (with the coolant waterfall). It

I remember the facility my mother worked at had a family-day and I went on a tour, and got to see an actually operating Cray-2 (with the coolant waterfall). It was mesmerizing. So much cooler than rows of cabinets full of rack-mount equipment in a modern data center :)