An Engineer who only imagines things (aka the best kind of Engineer)
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Thus the image of a centaur is the result of combining the common percepts of man and horse: fairy tales and fiction generally are the result of this process of combination.
Imagination in this sense, not being limited to the acquisition of exact knowledge by the requirements of practical necessity, is up to a certain point free from objective restraints.
In various spheres, however, even imagination is in practice limited: thus a man whose imaginations do violence to the elementary laws of thought, or to the necessary principles of practical possibility, or to the reasonable probabilities of a given case is regarded as insane.
Imagination is, in general, the power and process of producing mental images and ideas.
Imagination in another sense, not being limited to the acquisition of exact knowledge by the requirements of practical necessity, is, up to a certain point, free from objective restraints.
In ignorance of pathology he is satisfied with this explanation, and actually believes in it, whereas such a hypothesis in the mind of someone who understood germ theory it would be treated as a pure effort of imagination, or even as a hallucination.