Western philosophy emerged in the sixth century BC along the Ionian coast. A small group of scientist-philosophers began writing about their attempts to develop "rational" accounts regarding human experience. These early Pre-Socratic thinkers thought that they were dealing with fundamental elements of nature.
It is natural for humans to seek knowledge. In the "Metaphysics" Aristotle wrote "All men by nature desire to know".
The attempt to seek knowledge presupposes that the world unfolds in a systematic pattern and that we can gain knowledge of that unfolding. Cognitive science identifies several ideas that seem to come naturally to us and labels such ideas as "Folk Theories".
The Folk Theory of the Intelligibility of the World
The world makes systematic sense, and we can gain knowledge of it.
The Folk Theory of General Kinds
Every particular thing is a kind of thing.
The Folk Theory of Essences
Every entity has an "essence" or "nature," that is, a collection of properties that makes it the kind of thing it is and that is the causal source of its natural behavior.
The consequences of the two theories of kinds and essences is:
The Foundational Assumption of Metaphysics
Kinds exist and are defined by essences.
We may not want our friends to know this fact but we are all metaphysicians. We, in fact, assume that things have a nature thereby we are led by the metaphysical impulse to seek knowledge at various levels of reality.
Cognitive science has uncovered these ideas they have labeled as Folk Theories. Such theories when compared to sophisticated philosophical theories are like comparing mountain music with classical music. Such theories seem to come naturally to human consciousness.
The information comes primarily from "Philosophy in the Flesh" and
http://www.wku.edu/~jan.garrett/302/folkmeta.htm