Cognitive scientists and child psychologists have determined that children develop a complex conceptual structure, a sort of mental taxonomy of the world around them, which they use to order and define objects when they see them.

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There was, however, an even bigger conceptual breakthrough: the mobile device as general purpose computer, open to the world of software, powered by the resources of the cloud.

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The Canadian-American border, the longest border in the world between two countries, is as willful an act of imagination as a work of conceptual curtaining by Christo, but its existence has made two separate peoples, with two separate stories.

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Perhaps his savviest find was Orozco, the Mexican conceptual artist who, through the patronage of Lopez and others, went from virtual unknown to art-world hotshot mainly through the popularity of his Cibachromes, which are photographic prints saturated with colors.

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