James Brown inserted a monitor and a processor into a tiny brick and ran a DOOM demo on it.
Take a look at this impressive feat: Engineer James Brown managed to get DOOM on a LEGO brick. The brick is used as an external monitor while the game seems to be controlled from another device. But we could expect a full-blown computer out of LEGO because Brown has already added a trench run into one of the details and got the capacitive touch in the studs.
Earlier this month, James Brown shared some crazy developments in the field of LEGO science when he fit a small 0.42" OLED monitor and a Cortex M0 processor with 4K RAM into a 3D printed brick.
Something similar was also done by Dyoramic, but the computer was much bigger.