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Seeing Dark ThingsThe Philosophy of Shadows$
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Roy Sorensen

Print publication date: 2008

Print ISBN-13: 9780195326574

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780195326574.001.0001

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Shadowgrams and the Black Drop

(p.146) 7 Para-reflections
Seeing Dark Things

Roy Sorensen (Contributor Webpage)

Oxford University Press

Can a flame cast a shadow? The blocker theory of shadows answers no because flames emit light. However, a candle on a white surface does appear to cast a flame. Denying that the dark patch created by the flame is a shadow saves the blocker theory of shadows. It is instead a shadowgram – a kind of para-refraction much like the para-reflections of the preceding chapters.

Keywords:   refraction, shadow, shadowgram

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