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Abstraction is the thought process wherein ideas are distanced from objects.
Abstraction uses a strategy of simplification of detail, wherein formerly concrete details are left ambiguous, vague, or undefined; thus speaking of things in the abstract demands that the listener have an intuitive or common experience with the speaker, if the speaker expects to be understood.
For example, lots of different things have the property of redness: lots of things are red. And we find the relation sitting-on everywhere: many things sit on other things. The property of redness and the relation sitting-on are therefore abstract.
Problems begin to arise; however, when we try to define specific rules by which we can determine which things are abstract, and which concrete.
Something is often considered abstract if it does not exist at any particular place and time but instances, or members, of it can exist in many different places and/or times (we say that what is abstract can be multiply instantiated).
If however we just say that what is abstract is what can be instantiated, and that abstraction is simply the movement in the opposite direction to instantiation, we haven't explained everything. That makes 'dog' and 'telephone' abstract ideas, but even small children can recognise a dog or a telephone despite their varying appearances in particular cases. You could say that these concepts are abstractions but are not found to be very abstract in a conceptual sense. We can look at the progression from dog to mammal to animal, and see that animal is more abstract than mammal; but on the other hand mammal is a harder idea to express, certainly in relation to marsupial.
Things are often said to be concrete, that is, not abstract, when they have physical existence or when they occupy space.
In general, a concept is considered concrete if it is not abstract: it must be both particular and an individual, and hence occupy both space and time. To say that a physical object is concrete is to say, approximately, that it is a particular individual that is located at a particular place and time.
Abstract things are sometimes defined as those things that do not exist in reality or exist only as sensory experience, like red. The problem begins to arise here when we try to decide which things are, in fact, real. Is God real, or abstract? Even if real, could God also be abstract? Is the number 2 real? Is goodness real, or only its effects, or is it just an abstract idea created by humans?
Abstraction in philosophy is the (oft-alleged) process, in concept-formation , of recognizing among a number of individuals some common feature, and on that basis forming the concept of that feature. The notion of abstraction is important to understanding some philosophical controversies surrounding empiricism and the problem of universals.
If we say that properties and relations are, or have being, clearly we mean they have a different sort of being from that which physical objects, like rocks and trees, have. That accounts for the usefulness of the word abstract. We apply it to properties and relations to mark the fact that if they exist, they do not exist in space or time, but that instances of them can exist in many different places.
On the other hand the apple and an individual human being are said to be concrete, and particulars, and individuals.
Confusingly, philosopherA philosopher is a person devoted to studying and producing results in philosophy. The word, "philosopher," literally means "lover of wisdom. Popular Western philosophers in (approximate) historical order Not listed above: (some of) The Presocratics Epicus sometimes refer to tropeAnother meaning of 'Trope' is Jewish cantillation. Linguistic usage A trope is a play on words, a word used in something other than what is considered its literal or normal form. It comes from the greek word, tropos which means a "turn", as in heliotropes, or property-instances (e.g., the particular redness of this particular apple), as abstract particular s.