Thanks for wading through all the p-zombie foolishness!

However, it's very easy to imagine a round square: just imagine it in one dimension.

It's also very easy to conceive that Chalmers himself is actually a p-zombie, and that p-zombies cannot do philosophy since conscious reflection is central to the endeavor (not blind computation); and having conceived of this we can safely ignore everything he says about p-zombies.

Not exactly airtight logic, but....