Are sensations dependent on your impression of what the particular sensation should feel like? For example, pain. How do we know that pain generally causes hurt? Why does it make us feel uncomfertable? Zen priests are able to put an immense amount of pressure on their arms (about 1000 pounds, according to a particular documentary I saw), such that for a "normal" (that is, an average non Zen practicing human being) human, it would crush their arms. They say that they are able to withstand this enormous amount of pressure because they are able to control their "chi" (their life energy). They do this by deep concentration, by meditation. They basically concentrate on calming their body, and mind and controlling their emotions. Apparently, when placing a thousand pound object on their arms (when their arms are on a stone table, on Earth) , they don't feel anything uncomfertable...any pain. Are we just accustomed to thinking that certain things will cause pain, were others will not because of our natural instincts or just because of a social mind set (which if one carefully analyses what we like to do and how we are as a person, one will find that our social environment contributes to us immensely).