Here's another reductio ad absurdum illustration of comp.

If the version of comp we are discussing here is independent of physics, 
then shouldn't it be possible for us to program universal machines using 
only empty space? Length can be quantified, so why can't we just use 
millimeters or Planck lengths as the basis for our enumeration, addition, 
and multiplication and directly program from our mind to space? 

Of course, it would be hard to know where it was because we would be 
constantly flying away from a space that was anchored to an absolute 
position independent of Earth, the solar system, Milky Way, etc, but that 
shouldn't matter anyhow since whatever method we use to directly program in 
empty space with our minds should also give us access to the results of the 

What do you think? Just as wafers of silicon glass could in theory be 
functionally identical to a living brain, wouldn't it be equally prejudiced 
to say that empty space isn't good enough to host the computations of 


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