"you percieve with your mind"

Nicking a line out of the gorillaz song. "You don't see with your eyes , you perceive with your mind" and a later line "its all in your head " . Tim Leary and others used hallucinogenics to widen their perception . Shamen have been using various vegetable products to do the same thing for years . My question is, that If as I believe perception is very individual , How do we work as a society ? Even communication is in doubt . This can be seen very clearly in one type of dysphasia where the words you speak are perceived by the patient as being different words. The brain is interpreting the physical signals in a different way . We achieve a consensus agreement in society through social leaning , conditioning . and constructivist learning about the meanings of stimuli that are necessary for the functioning of a particular society . They are almost agreed metaphors rather than meanings.As Susan Sontag(Illness as a Metaphor (1978) explains some illnesses are perceived , i:e have metaphors that are stronger and have more impact on the individual, and society than their physical symptoms : are perceived as being more or less important than the physical symptoms would suggest . So is this true about many other aspects of our lives , of course it is ask an arachnophobic about the importance of the spider metaphors to them . Perhaps what Leary and the shamen are doing is removing the brain from this agreed consensus . Some mental health issues have been described as socially constructed , perhaps this is another example of a mind that refuses to join the consensus club . I believe that Einstein was criticised as a poor student probably because he did not perceive things in a consensus way . This raises problems for traditional type education if the consensus parameters are set , then anyone moving out of those parameters is mad , bad , or confused . We don't value challenges to the group consensus as they will affect the structures that support our own perception and make us challenge our social and individual learning which contribute to our perceptions . Perhaps the only way foreward for society is the constructivist pathway ?