> But we never
> think of it as imitating another machine.  We don't usually imagine
> that there's another machine out there that this Turing machine is
> pretending to be for the moment.  ImageMagick is a "program", not a
> "machine".

But this just points out the difference between general Turing
machines and *Universal* Turing machines (UTMs).  People think
about UTMs all the time.

Chris


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