>> Deeply awesome? Not really, no. It operates far, far too slowly to watch
>> it do anything useful.
> 
> Well, it is an "actual" Turing machine, what do you expect?

It's cool that it uses a pen to actually write numbers, but it instead 
it could just *stamp* them on there, typewriter style, it would be a lot 
faster. (And it wouldn't be moving the tape around, so it would be 
clearer which square is the current square.)

>> It's not clear which symbol is currently "under" the R/W head.
> 
> Fair critique. It would have been better to mount the scan head at the same
> place on tape as the pen, maybe at an angle, or even from the bottom.

Not to mention the erase head.

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