A Turing machine is only a device to illustrate an abstract mathematical construct. Of course you can build a device that resembles a Turing machine, but usuall

A Turing machine is only a device to illustrate an abstract mathematical construct. Of course you can build a device that resembles a Turing machine, but usually they do not come with an infinite tape as in the original definition. Another example of a real-world Turing machine can be found here: http://aturingmachine.com/ http://aturingmachine.com/