What's a Turing machine?
In 1936, a man named Alan Turing came up with a machine that ran on infinite tape. This tape is divided into cells, and each cell contains either a 0 or a 1—in other words, binary code. This machine is programmed to follow some simple rules: if it reads this number, overwrite it with the other number or do nothing, move this many steps in this direction.
After a certain number of steps, you may find that it's stopped running. Or it may be stuck in an infinite loop. Or maybe you've completely lost track, because the rules are somewhat complicated and it still hasn't stopped running after a few years.
Creations
Here are some projects dedicated individuals.