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barrier of ideas

noun
  1. philosophy the representations of objects which certain accounts of perception interpose between the objects themselves and our awareness of them, so that, as critics argue, we can never know whether there is in reality anything which resembles our perceptionsSee representationalism (def. 1)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012