TL;DR
I booted Debian Linux on a 4-bit intel microprocessor from 1971 - the first microprocessor in the world - the 4004. It is not fast, but it is a real Linux kernel with a Debian rootfs on a real board whose only CPU is a real intel 4004 from the 1970s. The video is sped up at variable rates to demonstrate this without boring you. The clock and calendar in the video are accurate. A constant-rate video is linked below.
Since it’s a wall art project, now get it to run Minecraft and runner redstone computer on it.
Now emulate the 4004 logic design in redstone on the 4004
And then this thing on top of that, again. Over and over.