Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An abstract object is an object which does not exist at any particular time or place, but rather exists as a type of thing (as an idea, or abstraction). In philosophy, an important distinction is whether an object is considered abstract or concrete. Abstract objects are sometimes called abstracta (sing. abstractum) and concrete objects are sometimes called concreta (sing. concretum). The type-token distinction identifies that physical objects are tokens of a particular type of thing. The "type" that it is a part of is itself an abstract object. The abstract-concrete distinction is often introduced and initially understood in terms of paradigmatic examples of objects of each kind:

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