OK, yeah, reading more[1] so I think the author is indeed considering things like computation on real numbers where, for example, the value of square root of two can only be approximated by a Turing machine but where ruler-and-compass construction hypothetically can construct this exactly.
So if you toss out the idea of computation involving digital computers, you can exhibit something not (exactly) Turing computable. If you have a chaotically behaving dynamic system and call it a computer, then you have something where computation becomes something in the eye of the beholder.
I'm not sure what questions this answers but there you are.
So if you toss out the idea of computation involving digital computers, you can exhibit something not (exactly) Turing computable. If you have a chaotically behaving dynamic system and call it a computer, then you have something where computation becomes something in the eye of the beholder.
I'm not sure what questions this answers but there you are.
[1] https://www.researchgate.net/publication/221512843_What_Is_a...