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Professor Fletcher proposes that it can be understood in terms of the normal functioning of the mind, which seeks to construct a working model of reality even though it has very little direct contact with that reality.
To mark the 100th anniversary of his birth, the legacy of Nelson Mandela (1918-2013), first president of democratic South Africa, will be considered - both within his country and in the wider world.
I will argue for the essential unity of speech and gesture in the transmission of thought, and suggest that we have underestimated the considerable communicative significance of these movements.