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Actually, some would argue that logic too is based on visual reasoning: http://mentalmodels.princeton.edu/about/what-are-mental-models/

Siva

> On 12 Nov 2014, at 7:54 am, Jeffrey Brown <[log in to unmask]> wrote:
> 
> I suppose I should add that I don't feel that this is strictly true. There
> is non-linguistic thinking. Clearly, when an architect or a mechanical
> engineering is visualizing how to design a building or a transmission, that
> is a form of thinking too. And it is not absurd to say that 3D mental
> manipulation is a form of reasoning. However, as to logic, as philosophers
> use the term, that seems to be based on language.
> 
> 
> On Tue, Nov 11, 2014 at 10:12 AM, Jeffrey Brown <[log in to unmask]> wrote:
> 
>> Although this may be pouring fuel on the fire, has it occurred to you all
>> that there may not be any form of logic that is entirely divorced from
>> language, that in spite of the protestations of logicians and
>> mathematicians, what occurs when humans think is that, underneath, they are
>> using language, i.e. talking to themselves? This is what the philosopher
>> Quine believed, that all reasoning was done, ultimately, through language.
>> So, when you are discussing whether PL or RNG or some other form of logic
>> be used as a basis for the grammar of a conlang, you might possibly be
>> chasing your tail.
>> 
>>