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A 1:20 scale model of the Cray YMP that set the world speed record in 1988. SN1002, "Reynolds", at NASA Ames Research Center, NAS Systems Division.
Sized to fit a Raspberry Pi 5, which can run a YMP emulator. The YMP cost tens of millions of dollars in 1988, but today a pi 5 8GB will set you back about $100, is 10x faster with 8x the RAM, and will fit on your desk. Moore's Law in action.
See thingiverse for detailed printing and assembly instructions, and a little history on this amazing system.