Screenshot from the YouTube channel SethBling
This guy basically just recreated a BASIC interpreter in Minecraft.
In the video, the YouTubeur explains that he has a degree in computer science, but still impressive, and gibberish to a lot of people haha...
With this you can compute programs from basic math operations to more complex stuff like listing the prime numbers, but it seems like it takes a lot of time for the system to process this.
Two whole weeks were required, he tells, to build the whole thing.