Povzetek

The famous duck-rabbit ambiguous image. Is it a duck? Is it a rabbit?

"The subject of a gestalt demonstration knows that his perception has shifted because he can make it shift back and forth repeatedly while he holds the same book or piece of paper in his hands. Aware that nothing in his environment has changed, he directs his attention increasingly not to the figure (duck or rabbit) but to the lines of the paper he is looking at. Ultimately he may even learn to see those lines without seeing either of the figures, and he may then say (what he could not legitimately have said earlier) that it is these lines that he really sees but that he sees them alternately as a duck and as a rabbit. ...As in all similar psychological experiments, the effectiveness of the demonstration depends upon its being analyzable in this way. Unless there were an external standard with respect to which a switch of vision could be demonstrated, no conclusion about alternate perceptual possibilities could be drawn." -- Thomas Kuhn, The Structure of Scientific Revolutions (3rd edn., p. 114).

Licenca

• Source: Jastrow, J. (1899). The mind's eye. Popular Science Monthly, 54, 299-312.

	Datoteka je v Združenih državah Amerike v javni domeni. To velja za ameriška dela, na katerih so avtorske pravice pretekle. Pogosto je za to razlog to, da je bilo delo prvič objavljeno pred 1. januarjem 1929. Podrobnejša razlaga je na razpolago na tej strani.
	Zunaj Združenih držav Amerike slika ni nujno v javni domeni. To velja zlasti za države in območja, ki za ameriška dela ne uporabljajo pravilo krajšega roka, npr. za Kanado, Celinsko Kitajsko (ne za Hong Kong ali Macao), Nemčijo, Mehiko in Švico. Avtor in leto izdaje sta bistvena podatka in morata biti navedena. Podrobnosti so na razpolago na straneh Wikipedia:Public domain in Wikipedija:Avtorske pravice.