In philosophy, ideas are usually construed as mental representational images of some object. Ideas can also be abstract concepts that do not present as mental images.[1] Many philosophers have considered ideas to be a fundamental ontological category of being.
The capacity to create and understand the meaning of ideas is considered to be an essential and defining feature of human beings. In a popular sense, an idea arises in a reflexive, spontaneous manner, even without thinking or serious reflection, for example, when we talk about the idea of a person or a place.
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- Plato
- René Descartes
- Charles Sanders Peirce
- David Hume