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Perception requires imagination because the data people encounter in their lives are never complete and always equivocal. For example, most people consider that the greatest evidence of an event one can obtain is to see it with their own eyes, and in a court of law little is held in more esteem than eyewitness testimony. Yet if you asked to display for a court a video of the same quality as the unprocessed data catptured on the retina of a human eye, the judge might wonder what you were tryig to put over. For one thing, the view will have a blind spot where the optic nerve attaches to the retina. Moreover, the only part of our field of vision with good resolution is a narrow area of about 1 degree of visual angle around the retina's center, an area the width of our thumb as it looks when held at arm's length. Outside that region, resolution drops off sharply. To compensate, we constantly move our eyes to bring the sharper region to bear on different portions of the scene we wish to observe. And so the pattern of raw data sent to the brain is a shaky, badly pixilated picture with a hole in it. Fortunately the brain processes the data, combining input from both eyes, filling in gaps on the assumption that the visual properties of neighboring locations are similar and interpolating. The result - at least until age, injury, disease, or an excess of mai tais takes its toll - is a happy human being suffering from the compelling illusion that his or her vision is sharp and clear. We also use our imagination and take shortcuts to fill gaps in patterns of nonvisual data. As with visual input, we draw conclusions and make judgments based on uncertain and incomplete information, and we conclude, when we are done analyzing the patterns, that out 'picture' is clear and accurate. But is it?

Leonard Mlodinow
The ceremonial differentiation of the dietary is best seen in the use of intoxicating beverages and narcotics. If these articles of consumption are costly, they are felt to be noble and honorific. Therefore the base classes, primarily the women, practice an enforced continence with respect to these stimulants, except in countries where they are obtainable at a very low cost. From archaic times down through all the length of the patriarchal regime it has been the office of the women to prepare and administer these luxuries, and it has been the perquisite of the men of gentle birth and breeding to consume them. Drunkenness and the other pathological consequences of the free use of stimulants therefore tend in their turn to become honorific, as being a mark, at the second remove, of the superior status of those who are able to afford the indulgence. Infirmities induced by over-indulgence are among some peoples freely recognised as manly attributes. It has even happened that the name for certain diseased conditions of the body arising from such an origin has passed into everyday speech as a synonym for "noble" or "gentle". It is only at a relatively early stage of culture that the symptoms of expensive vice are conventionally accepted as marks of a superior status, and so tend to become virtues and command the deference of the community; but the reputability that attaches to certain expensive vices long retains so much of its force as to appreciably lesson the disapprobation visited upon the men of the wealthy or noble class for any excessive indulgence. The same invidious distinction adds force to the current disapproval of any indulgence of this kind on the part of women, minors, and inferiors. This invidious traditional distinction has not lost its force even among the more advanced peoples of today. Where the example set by the leisure class retains its imperative force in the regulation of the conventionalities, it is observable that the women still in great measure practise the same traditional continence with regard to stimulants.

Thorstein Veblen
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