Abstract
A disk with a yellow and a blue sector is made to rotate swiftly. When the sectors have been appropriately chosen we will sec a neutral, gray color. We say, however: in ‘reality’ the color is still yellow and blue; the color change is a well-known sensed ‘optical illusion’ [Sinnestäuschung]. Or we say - at least in everyday language, and it is this alone which concerns us at the present —: in ‘real’, ‘physical’ space, the color is still yellow and blue; the ‘apparent’ gray color belongs to ‘phenomenal’ space, to ‘visual space’.
Original publication as Über das System der Wirklichkeitsbegriffe. Ein Beitrag zum logischen Empirismus, in Acta Philosophica Fennica 2 (Helsinki 1936).
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Notes
R. Carnap, Der logische Aufbau der Welt ( 1928; 2nd ed., Felix Meiner, Hamburg, 1961 )
Cf. A- Tarski, ‘Der Wahrheitsbegriff in den formalisierten Sprachen’, Studia Philos- ophica 1 (Lemberg, 1935). p. 260ff.
Cf. K. Popper, Logik der Forschung Vienna, 1935), esp. pp. 3 If., 52f.
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R. Carnap, ‘Psychologie in physikalischer Sprache’, Erkenntnis 3 (1932)
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Cohen, R.S. (1979). On The System of the Concepts of Reality A Contribution to Logical Empiricism. In: Cohen, R.S. (eds) Reality and Experience. Four Philosophical Essays, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9381-5_2
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