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1990 in science
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==Psychology== * [[Roger Shepard]]'s ''Mind Sights'' presents the "[[Shepard tables]]" illusion.<ref>{{cite book|last=Colman|first=Andrew M.|title=A Dictionary of Psychology|year=2009 |url=http://www.oxfordreference.com/view/10.1093/oi/authority.20110803110312149?rskey=EtCz6d&result=1|edition=3|publisher=Oxford University Press|isbn=9780191726828|quote=The illusion was first presented by the US psychologist Roger N(ewland) Shepard (born 1929) in his book ''Mind Sights: Original Visual Illusions, Ambiguities, and Other Anomalies'' (1990, p. 48), Shepard commented that 'any knowledge or understanding of the illusion we may gain at the intellectual level remains virtually powerless to diminish the magnitude of the illusion' (p. 128).}}</ref>
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