text: The basilica 's highlight , and generally accepted as the work of a young Giotto , the Life of Francis ( 1296-1304 ) is movingly celebrated in 28 scenes along the lower tier ( starting from the right transept ) , while 32 frescoes in the upper tier illustrate scenes from the Old and New Testament .
  
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  The frescoes in the lower tier were created before those in the upper tier .