According to a popular legend, Newton thought of the Universal Law of Gravitation while he was sitting under an apple tree and an apple fell on his head. This story expresses two main concepts: a scientific mind is always elaborating ideas and novel explanatory ideas might be found in unexpected places or through a “changed perspective”. Many important ideas in science have seemed to appear “out of the blue”, as represented by the metaphorical light-bulb, apple head bonk, or intuitive dream. Among theories about the creative process, one explains that it begins with the generation of “crudely formed ideas and associations, followed by their exploration through evaluation and testing”. In the process of associations of ideas the concept of “linking” is important in connecting human thoughts with the external environment.
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