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Stranger
Str. The appearances in dreams, and those that arise by day and are said to be spontaneous—a shadow when a dark object interrupts the firelight, or when twofold light, from the objects themselves and from outside, meets on smooth and bright surfaces and causes upon our senses an effect the reverse of our ordinary sight, thus producing an image. This was the current explanation of reflection. Mirrors and smooth objects were supposed to contain a luminous principle which met on the smooth surface with the light coming from the object reflected. So in the act of vision the fire within the eye united with the external fire (Plat. Tim. 46a). The words τῆς ἔμπροσθεν . . . ἐναντίαν αἴσθησιν refer to the transposition of right and left in the reflection (cf. Plat. Theaet. 193c).
Theaetetus
Theaet. Yes, these are two works of divine creation, the thing itself and the corresponding image in each case.
Stranger
Str. And how about our own art? Shall we not say that we make a house by the art of building, and by the art of painting make another house, a sort of man-made dream produced for those who are awake?
Theaetetus
Theaet. Certainly.
Stranger
Str. And in the same way, we say, all the other works of our creative activity also are twofold and go in pairs—the thing itself, produced by the art that creates real things, and the image, produced by the image-making art.
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