Visual reasoning is the process of manipulating one's mental image of an object in order to reach a certain conclusion – for example, mentally constructing a piece of machinery to experiment with different mechanisms. In a frequently cited paper in the journal Science and a later book Eugene S. Ferguson, a mechanical engineer and historian of technology, claims that visual reasoning is a widely used tool used in creating technological artefacts. There is ample evidence that visual methods, particularly drawing, play a central role in creating artefacts. Ferguson's visual reasoning also has parallels in philosopher David Gooding's argument that experimental scientists work with a combination of action, instruments, objects and procedures as well as words. That is, with a significant non-verbal component.
Ferguson argues that non-verbal (largely visual) reasoning does not get much attention in areas like history of technology and philosophy of science because the people involved are verbal rather than visual thinkers.
Those who use visual reasoning, notably architects, designers, engineers, and certain mathematicians conceive and manipulate objects in "the mind's eye" before putting them on paper. Having done this the paper or computer versions (in CAD) can be manipulated by metaphorically "building" the object on paper (or computer) before building it physically.
- Ferguson, Eugene S. 1977. The Minds Eye: Non-Verbal Thought in Technology. Science 197 (4306):827-836.
- Ferguson, Eugene S. 1992. Engineering and the mind's eye. Cambridge, Mass.: MIT Press.
- Gooding, David. 1990. Experiment and the making of meaning : human agency in scientific observation and experiment. Dordrecht ; Boston: Kluwer Academic Publishers.
- Tesla, Nikola (2007) [first published 1919]. My Inventions: The Autobiography of Nikola Tesla. Wilder Publications. p. 19. ISBN 1934451770.