Primary/secondary quality distinction
The primary/secondary quality distinction is a conceptual distinction in
epistemologyand metaphysics, concerning the nature of reality. It is most explicitly articulated by John Lockein his " Essay concerning Human Understanding", but earlier thinkers such as Galileoand Descartesmade similar distinctions.
Primary qualities are properties that objects have independent of any observer, such as
shape, extension, number, solidity, and volume.
Secondary qualities are properties that produce sensations in observers, such as
colour, taste, smell, and sound.
Primary qualities are measurable aspects of physical reality. Secondary qualities are subjective.
* “By convention there are sweet and bitter, hot and cold, by convention there is color; but in truth there are atoms and the void” – Democritus, Fragment 9. [(Quoted by Sextus Empiricus, "Adv. Math." vii 135)]
* “I think that tastes, odors, colors, and so on are no more than mere names so far as the object in which we locate them are concerned, and that they reside in consciousness. Hence if the living creature were removed, all these qualities would be wiped away and annihilated” – Galileo Galilei, "The Assayer" (published 1623). [As reprinted in (Drake, 1957, p. 274)]
* “For the rays, to speak properly, are not colored. In them there is nothing else than a certain power and disposition to stir up a sensation of this or that color.” – Isaac Newton "Optics" (3rd ed. 1721, original in 1704). [Reprinted in (Newton, 1953, ed. Chris Jamieson, p. 100)]
George Berkeleyis a famous critic of the distinction. Berkeley says even primary qualities only exist in perceptions, as the notion of a wholly unperceived material object, Berkeley alleges, is incoherent. We cannot conceive of an object existing unconceived- because, as soon as we think of it, it is no longer unconceived. We can however conceive that an object could exist without being firstly conceived, which defeats his point.
The idea of
qualia, proposed by C.I. Lewis in 1929 and defined as the 'what it is like' character of mental states, is broadly similar to the concept of a secondary quality.
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