[rbanffy]

The Cray-2 had some indicator lights on the top of each lobe. I'm not sure how helpful they were to gain an understanding of what the computer was doing. I can't tell how much work my home cluster is doing by looking at the ethernet switch LEDs.

The LCD would nicely replicate the window-as-whiteboard experience though, at the sacrifice of some readability, because the object behind the glass is so interesting.