Techy nerd builds a 1Hz CPU in Minecraft!

[Retro]

And it's fascinating.

Note the caveat from the creator before watching the video:

I should probably have made this clearer in the video but all programs shown were sped up by a factor of between a hundred and a few thousand times in order to make them actually playable/watchable in real time. While 1Hz is definitely fast for a redstone processor, it's nowhere near as fast as the video may make it out to be. Sorry for any confusion caused!

I'd quite like to see a second video showing this operating in realtime.