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I feel like I'm having a Mandela Effect moment because this seems very familiar.
I did some searching and it reminded me that there was a shop called Tesseract Computers in my home town.
For the blue cube, are you perhaps thinking of an SGI workstation of some sort? Some of those were blue cubes.
The SGI workstation looks nothing like the cube I'm talking about. It's cube-like, I admit, but the Tesseract was a perfect cube, all sides even. It had different components on different sides, exposed circuitry.