text: Inside , on the ceiling of the central octagonal dome , are Correggio 's greatest masterpieces , his frescoes of the Assumption of the Virgin ( 1530 ) where he achieved , in the truest sense , exalting emotion without the sentimentality of Mannerist imitators .
  
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  Correggio 's work is displayed on both the ceiling and walls of the dome , with his best pieces on the ceiling .