When scientists need to explain difficult points of theory, illustration by hypothetical example – rather than by total abstraction – works well (perhaps indispensably) as a rhetorical device. Such cases do not function as speculations in the pejorative sense – as silly stories that provide insight into complex mechanisms – but rather as idealized illustrations to exemplify a difficult point of theory. (Other fields, like philosophy and the law, use such conjectural cases as a standard device.)
Each thought himself, especially since this last promotion, to be indispensably necessary to the formation of London society, and was comfortable in the conviction that he had thoroughly succeeded in life by acquiring the privilege of sitting down to dinner three times a week with peers and peeresses.Anthony Trollope
The study of Industrial Design is really as indispensably necessary as the ordinary rudiments of learning. It ought to form an essential feature in the education of young persons for whatever profession or employment they may intend to select, as the great business of their lives; for without a knowledge of drawing, no scientific work, whether relating to Mechanics, Agriculture, or Manufactures, can be advantageously studied.
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