Anaxagorean sensations are simple, common and unmistakable. They are usually noticed in opposing pairs. We name them after the ancient Greek philosopher Anaxagoras of Clazomenae because he started linking them to European physics. To be exact, we say that a sensation is **Anaxagorean** if for just one, and only one, of the binary characteristics noted by and . These simple, clear-cut perceptions are shown in the table below, along with an associated icon.

The numerical values of depend on making binary descriptions of sensory experience. So sensations that are complex or ambiguous cannot satisfy this definition, even if they are common and important. For example, the colour orange is not unmistakably red or yellow, so it is not Anaxagorean. A sensation must be perfectly *distinct* to be Anaxagorean. The descriptive method of EthnoPhysics is based on mathematical sets of sensations. Arithmetic and algebra are also based on set-theory. And the founder of set-theory Georg Cantor says that a set is “a collection into a whole, of definite, well-distinguished objects.”^{1}E. Kamke, *Theory of Sets*, page 1. Translated by Frederick Bagemihl. Dover Publications, New York, 1950. Or in another translation as, “definite and separate objects.”^{2}Georg Cantor, *Contributions to the Founding of the Theory of Transfinite Numbers*, page 85. Translated by Philip E. B. Jourdain. The Open Court Publishing Company, La Salle Illinois, 1941. Moreover, distinguishability is required^{3}Wolfgang Pauli, *General Principles of Quantum Mechanics*, pages 117 and 123. Translated by P. Achuthan and K. Venkatesan. Springer-Verlag, Berlin Heidelberg 1980. to develop Pauli’s exclusion principle .

Anaxagorean sensations are building-blocks we can use to describe more complicated sensations. They *must* be distinct so that we can accurately count them, use mathematics to analyze the results, and thereby scientifically describe events.

1 | E. Kamke, Theory of Sets, page 1. Translated by Frederick Bagemihl. Dover Publications, New York, 1950. |
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2 | Georg Cantor, Contributions to the Founding of the Theory of Transfinite Numbers, page 85. Translated by Philip E. B. Jourdain. The Open Court Publishing Company, La Salle Illinois, 1941. |

3 | Wolfgang Pauli, General Principles of Quantum Mechanics, pages 117 and 123. Translated by P. Achuthan and K. Venkatesan. Springer-Verlag, Berlin Heidelberg 1980. |