The Raven Paradox Socks
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Description: A black sphere and a green apple face each other across an equivalence sign: does the apple confirm that all ravens are black? 'All ravens are black' is logically equivalent to 'all non-black things are non-ravens'. So each green apple seems to confirm the claim about ravens, an absurd but valid consequence. Source: Carl Gustav Hempel, Studies in the Logic of Confirmation, 1945. Part diagram, part artwork: a conversation piece for readers, thinkers and debaters.
