There you are denying flexibility again. Why should the brain use categorisation and have it fundamentally hard wired? It is a learned, created thing.
Studies done of feral children (those raised without significant interaction with other humans) indicate that people raised with no societal "schema" or programming at all can distinguish between different things. They categorize. This suggests that categorization is not a cultural artifact, but a part of the human mind, present from birth.
The mind is but a cogitating device that is absolutely flexible.
Well, no. (again.)
While I admit that we don't know everything we'd like to know about how the human mind functions (sit in on an upper-level psychology course some time - I recommend anything with the word "cognition" in the course title), we do know a few things about what it does and the way it works.
Firstly, it is not absolutely flexible. The brain (as the seat of what we might call the mind) is a pretty amazing organ, able to reroute pathways around existing damage to allow people who might otherwise have no function in a given area some semblance of functionality. While this would seem to support your contention (that it is absolutely flexible), there are things it can't do. The halves of the brain can't talk to each other if the corpus callosum is severed, which means that there are people whose right hands really don't have any idea what the left is doing.
Other examples of this: the impulse to communicate seems to be hard-wired. Only in brain-damaged or horribly psychologically crippled individuals is the desire to communicate with others extinguished or seemingly not absent. One would think that a flexible mind could rewire itself without the desire for communication, and at first glance this is possible (witness catatonics), but it does not seem to be possible without a great number of deleterious side effects.
Color is hard-wired as well. We have different names for colors, but barring brain damage or some ocular defect, we are always aware of color. A color-sighted person cannot wake up one morning and decide to live in a monochromatic world without mechanical assistance.
Avoidance of pain is another hard-wired impulse. While you might be quick to point to the examples of masochists or those who endure pain to assist others (or to make it through basic training), consider that those people might be avoiding a perceived pain of greater magnitude: the pangs of sexual frustration, the agony of conscience felt when one might have helped another but did nothing instead, or to avoid the shame and anguish of not passing basic training (not to mention the ministrations of the drill sergeant).
People avoid whatever pain seems greatest.
I could go on for a while, but my point should be obvious by now: there are at least a few behaviors and characteristics present in human beings which do not seem to be alterable except through intensive psychological training or brain damage. The existence of these behaviors and characteristics would tend to suggest that the human mind is not absolutely flexible, but possessed of at least a few fundamentals.
(if this seems disjointed, it may be due to a raging fever and some sinus drugs. That I'm able to type at all is a testament to the drive to communicate.)
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