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{{#invoke:Hatnote|hatnote}} Abstraction in its main sense is a conceptual process by which general rules and concepts are derived from the usage and classification of specific examples, literal ("real" or "concrete") signifiers, first principles, or other methods. "An abstraction" is the product of this process—a concept that acts as a super-categorical noun for all subordinate concepts, and connects any related concepts as a group, field, or category.<ref name=Langer>Suzanne K. Langer (1953), Feeling and Form: a theory of art developed from Philosophy in a New Key p. 90: "Sculptural form is a powerful abstraction from actual objects and the three-dimensional space which we construe ... through touch and sight."</ref>

Conceptual abstractions may be formed by filtering the information content of a concept or an observable phenomenon, selecting only the aspects which are relevant for a particular purpose. For example, abstracting a leather soccer ball to the more general idea of a ball selects only the information on general ball attributes and behavior, eliminating the other characteristics of that particular ball.<ref name=Langer/> In a type–token distinction, a type (e.g., a 'ball') is more abstract than its tokens (e.g., 'that leather soccer ball').

Abstraction in its secondary use is a material process,<ref name="ReferenceA">Alfred Sohn-Rethel, Intellectual and manual labour: A critique of epistemology, Humanities Press, 1977</ref> discussed in the themes below.

Abstraction sections
Intro  Origins  Themes  As used in different disciplines   See also   Notes  References  External links  

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